I really liked the original idea where people could review guides in order to get points for their own guide to be added to the review pool; maybe people who review without a guide to add to the review pool are given +rep instead, like you suggested.
So how I see it:
I review the MobaFire Review Opt-In Guide (made specifically for the purpose of reviewing - this guide should have a section that is deliberately written with some common mistakes that members should review); reading this guide is sort of like a wizard, it tells me the purpose of reviewing, the rewards, and the process as well as giving me something to practice reviewing on. In addition, the comment section would be full of previous reviews, so I'll know how I should be reviewing. (Mods would have to watch this to ensure people don't just copy and paste reviews)
Once the MobaFire Review Opt-In Guide is reviewed, the review counter next to my profile gear will tell me that I need to review two more guides to get my own guide in the review pool. Clicking on the 2 will direct me to a list of guides to be reviewed. These guides don't have to be new OR with low vote counts, they are in the review pool because they've followed these steps (in the early days, the review pool can be populated with new guides until the system gets going). The reason why I don't think it's a good idea for guides to automatically get into the review pool (beyond the fact that others are working to get their guides there) is that some people write guides and abandon them, meaning a review would be useless.
The list of guides to be reviewed should be limited so that the reviewer is not spoiled for choice. When presented with a lower number of guides, the reviewer will feel less overwhelmed. I can then pick one of these guides to review. To enable my comment as a review, I will have to click a check box which says something of the sort ("Enable Review" or something). This button will also automatically add the guide to my notifications, so I know when someone else comments on the guide. There will be a word/character count above the comment box, that tells me when I've reached over 100 words and the "Submit" button will become clickable only once I've typed over 100 words (or xxx amount of characters, if that's easier).
I submit my review (and vote, if applicable) and I notice my review counter has gone to 1. I follow the same process (a new list of guides will appear to be reviewed) until the number is now a star (or whatever). Clicking on the star brings me to a page where I can nominate one of my guides to be added to the review pool OR receive 3 +rep for the 3 reviews I've completed. This means I don't have to have a guide to add to the review pool AND I still get rewarded for reviewing.
Say I choose my Ashe guide to be reviewed. There's no telling when it'll be reviewed, but eventually it will be. Once it has been reviewed through this system, it is taken off the review pool, and I'd have to review another 3 guides before I can nominate my Ashe guide again.
I don't think there should be a cap for getting +rep for reviewing. I just think there should be more titles, so people are more eager to progress through the ranks :P
So how I see it:
I review the MobaFire Review Opt-In Guide (made specifically for the purpose of reviewing - this guide should have a section that is deliberately written with some common mistakes that members should review); reading this guide is sort of like a wizard, it tells me the purpose of reviewing, the rewards, and the process as well as giving me something to practice reviewing on. In addition, the comment section would be full of previous reviews, so I'll know how I should be reviewing. (Mods would have to watch this to ensure people don't just copy and paste reviews)
Once the MobaFire Review Opt-In Guide is reviewed, the review counter next to my profile gear will tell me that I need to review two more guides to get my own guide in the review pool. Clicking on the 2 will direct me to a list of guides to be reviewed. These guides don't have to be new OR with low vote counts, they are in the review pool because they've followed these steps (in the early days, the review pool can be populated with new guides until the system gets going). The reason why I don't think it's a good idea for guides to automatically get into the review pool (beyond the fact that others are working to get their guides there) is that some people write guides and abandon them, meaning a review would be useless.
The list of guides to be reviewed should be limited so that the reviewer is not spoiled for choice. When presented with a lower number of guides, the reviewer will feel less overwhelmed. I can then pick one of these guides to review. To enable my comment as a review, I will have to click a check box which says something of the sort ("Enable Review" or something). This button will also automatically add the guide to my notifications, so I know when someone else comments on the guide. There will be a word/character count above the comment box, that tells me when I've reached over 100 words and the "Submit" button will become clickable only once I've typed over 100 words (or xxx amount of characters, if that's easier).
I submit my review (and vote, if applicable) and I notice my review counter has gone to 1. I follow the same process (a new list of guides will appear to be reviewed) until the number is now a star (or whatever). Clicking on the star brings me to a page where I can nominate one of my guides to be added to the review pool OR receive 3 +rep for the 3 reviews I've completed. This means I don't have to have a guide to add to the review pool AND I still get rewarded for reviewing.
Say I choose my Ashe guide to be reviewed. There's no telling when it'll be reviewed, but eventually it will be. Once it has been reviewed through this system, it is taken off the review pool, and I'd have to review another 3 guides before I can nominate my Ashe guide again.
I don't think there should be a cap for getting +rep for reviewing. I just think there should be more titles, so people are more eager to progress through the ranks :P
What about a different kind of score system - similar to the Q&A system.
So once you review a guide, people who also review the guide or just happen to get to that guide, could vote on your review (good/bad - fair/unfair) and when you get a certain amount of points you'll get "Review Trainee" badge, some more and you'll get "Reviewer" and some more and you'll get "Master Reviewer" badge (names just something that popped out of my head and basically placeholders)
So once you review a guide, people who also review the guide or just happen to get to that guide, could vote on your review (good/bad - fair/unfair) and when you get a certain amount of points you'll get "Review Trainee" badge, some more and you'll get "Reviewer" and some more and you'll get "Master Reviewer" badge (names just something that popped out of my head and basically placeholders)

What if we made a system where you can review a guide(it doesn't matter weather you have one yourself or not) to earn some kind of review points? You could use those points to enter your own guide(s) into the pool of guides to be reviewed.
It would also be possible to add janitsus suggestion into it(Every 1/3/5 upvotes get you a review point-someone should have a look at this and balance it correctly).
There could also be an option to convert review points into +rep.
It would also be possible to add janitsus suggestion into it(Every 1/3/5 upvotes get you a review point-someone should have a look at this and balance it correctly).
There could also be an option to convert review points into +rep.

Thanks to IPodPulse for this <3^
^That's exactly what my post said... ... ...
Jan: I like the idea of people being able to rate reviews too. Maybe you can get extra review pool points for getting upvotes. I don't think downvotes should remove review points though.
Jan: I like the idea of people being able to rate reviews too. Maybe you can get extra review pool points for getting upvotes. I don't think downvotes should remove review points though.
I think we misunderstood each other. For example, you may need to review 3 guides before you submit your own. Now say you get an upvote for one of your reviews. Now, possibly, you should only need to review 2 guides, as that upvote counts as a review (may be too powerful). On the flipside if you write a really bad review and someone downvotes it, you don't get punished - remember, anyone can vote, including the guide owner, who may dislike your opinion (even if it's right) and downvote you out of spite.
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Allowing non-authors in... Hmm could be nice. Well, maybe a way to help non-authors might be a similar system but instead we automatically pick guides that have low vote counts and/or low comment counts. This helps drive the community to the most optimum places to help authors out and increase the guide quality on the site. We could consider rewarding an automatic point of rep in exchange for your contribution, if there is a minimum word count of say 100... Maybe with a daily limit of how much rep you can earn per day for helping out like this.
So that's kind of two systems - a review+vote exchange for authors, and a guide quality improvement system with rewards for non-authors. I like both, and not seeing any major flaws in them yet, as long as we have some restrictions on the +rep to avoid abuse.