My remarks on the guide were a little over the place; I decided to write down everything in a PDF, because it'd just be easier for you to see what i'm talking about. I think your guide does an OKAY job of teaching your readers about blitzcrank, but that there is rooom for improvement as well. One thing to note, is that if i ask you a question, it's usually hinting that the paragraph i'm talking about needs some more clarity, or needs something changed. I found myself understanding most of what you were saying in your guide, but i'm sure there were a few areas that could confuse your readers.

Here's a link to my review of the guide.

Looking at my scanned PDF now, i'm noticing that some of my comments are hard to read; I'll transcribe my notes onto a separate spoiler in case you can't read something i'm saying :S

Pg 1/19
Unusual rune load out sets a skeptical first impression of the guide

2/19
I’d swap these 2; Mikael’s mana regen basically means you’ll always be at full mana
Ah, I see

I thought E max 2nd wasn’t particularly good if you don’t run CDR on blitz; W max gives you a lot of extra MS that you can use to run or chase

3/19
Are these supposed to be off-center?

5/19
Then I expect at least 1 section on how to hook people
Talk about when/who NOT to hook; if you hook an amumu into your team, you probably just single handedly lost your team that fight, e.g.

6/19
If you’re so concerned w. getting off multiple E’s, I’m surprised you hold off on rushing CDR
I’m skeptical about Mpen marks
You don’t exactly rush armor though. Your first items are Sightstone and targon’s brace, which by your logic would actually incentivize putting more emphasis on armor.
Don’t talk about runes you don’t use

7/19
Intelligence is a really good mastery. I don’t see how Reinforced Armor + 1.5 Armor + 5 MR > 10% CDR on items + 5% CDR on spells
11/19
I see – the mana regen from talisman of ascension is enough!
RE: Situational items: Maybe you should take these items out if you almost never buy them.

12/19
Caitlyn: Ace in the Hole acts as a good execute spells; She can Yordle Snap Trap on your target right when you pull them and the snare will occur just after the CC from Power Fist ends.
Playing against: power fisting her mid-net will cancel her Dash and probably force a summoner spells.
Corki: His phosphorous bombs do a LOT of damage. Quite oddly enough, you say that he has good synergy because he can burst hard after level 4. Looking at your support matchups, you encourage people to go for all-ins before level 4. Not saying you’re contradicting yourself, but you may need to reword a couple things.
Playing against: Valkyrie is basically a summoner spell; If you force him to Valkyrie out, he is quite vulnerable for the next ½ minute.

13/19
Draven: Playing against: Your CC stops him from catching some axes.
Graves: Playing against: Graves is easy to grab; Quickdraw’s dash animation is quite slow and predictable.
Jinx: I know it’s a high synergy, but you forgot to write that: P

14/19
Lucian: Might want to include that Lucian is very good at following up on tower dives
Miss Fortune: Playing against: Static Field is a REALLY easy way of cancelling her ult in lane.

15/19
Varus: Playing against: I get what you’re trying to say, but you need to make It clearer – Varus is really vulnerable right after his Piercing Arrow goes on CD.
Vayne: Mention something about strong brush control in this lane. Also, I disagree that this is a strong matchup; you say that Blitzcrank and Twitch have a weak early game because twitch doesn’t deal a lot of damage, and I’d thing that that would be even more so the case with vayne.

16/19
Supports: A general trend I’ve been noticing is that you tend to spend a lot of time explaining why a land is hard; this is OK, but I’d like to see more content on HOW you play against a given lane. I underlined the meaningful parts of some of this section to try and highlight the kind of content that I’d like to see more of.
Braum: Exactly what do you mean by ‘smart play’? Expand please
Janna: Reiterate that she’s got no lane presence for the next 6 seconds after her shield wears off on her carry.
Karma: If she Mantras, you won’t have time to run away; the Inner Flame will probably hit you. The best chance you have of dodging it is side stepping it. She’s easier to handle if you have an ADC who can clear minion waves fast like Lucian, because it makes it more difficult for her and her allies to dodge a hook.
Leona: Talk about what you do if she does jump on you or your carry; If she jumps on your carry, your responsibility is to either pull her under your tower if you are being pushed in, or to CC the enemy ADC.

17/19
Morgana: Yep, impossible lane
Nami: What is the easiest way to hook her? I think that the matchup will depend on her ADC. If she is laning with someone with no dueling potential early game like Twitch, you can kind of just run up to her and burst her lol.
Sona: Good explanation; I’d like to see more of this on the other supports that you cover.
Thresh: So do you always play defensively vs him past early game?
Zilean: I SERIOUSLY hope you’re going to teach readers how to actually land these early game hooks; I’m seeing the works “Hook at levels 1-3” a LOT.

18/19
Elaborate on the limits of blitzcrank
There was NO section on team fighting, and no section on how to land hooks
Ending remarks:
I’d really like to see you add these two sections to your guide. Earlier in the guide, you wrote that blitzcranks are defined by Rocket Grab, so teaching your readers how to land their hook is really important; I’d really encourage you to find some way of doing this. In my experience, I’ve found that screenshots of actual game play is most effective. If you have some sort of game recording software like LoLRecorder, I’d recommend you look for a game there, and use pictures to explain how to land hooks, and more importantly, to explain YOUR way of thinking.
I’d also like to see a section on team fighting with blitzcrank, and a section on how to siege turrets and force objectives.