I really love this guide. Im pretty much using it all the time when playing as Thresh, with a little tweaks.

For example i play with slightly different runes and prefer maxing Q second rather then W, because the W shield isnt that big anyway (but mostly utility), but the cooldown of the Q decreases so hard, that you can pull sby in every 3 seconds (when hitting something), which gives you even more CC.

MF's skill variation (Q or W max) is pretty well known to be up to personal preference. Some champions do have a "right" skill sequence because other skilling orders are suboptimal. Draven would be a good example, as a Draven who does not max Q first is going to be flat-out weaker than a Draven who does.

Thresh is not one of the most contested picks in competitive play because he has a shield and can play safely. He has incredibly strong harass and trading potential if you max E and he's far weaker in a skirmish if you do not. It is the difference between a Thresh who throws lanterns to get souls and a Thresh who zones out the enemy carry while walking up to collect them. If you are playing Thresh and maxing W first, I seriously recommend changing your skill order and learning his true potential.

Ty for your opinions. I added some more info about leveling up Dark Passage over Flay.

Not at all. It saved my ADC many times, and it also allowed me to play safely and still collect souls. It also makes me survive extreme harassment. Just because something is the norm, doesn't mean everything else is useless.

MF, for instance. Everyone levels up Double-up. But me, and I know a lot of people as well, level up Impure Shots first. And we do perfectly fine! I can carry games just fine levelling up Impure Shots first on MF. It's seriously more to do with opinion and situation than it is about pure fact of "maxing this simply is better".

Shield max first is pretty worthless, not gonna lie. Im contemplating removing the mention of it from my own guide. XD

The problem is that it's not a matter of "Herp this is best, end of story!", it's literally a matter of preference and situation. I bet you will think twice before levelling up Flay if you're getting outzoned or your carry is an idiot. As such, some people will prefer to level up lantern first, simply put. Honestly, no one can say "This is what everyone does, with good reason, so this is what you should do otherwise yer a noob!", it's downright silly, and childish. Not to mention a lie.

Anyway, rant aside, awesome guide! Really looking forward to seeing it reach up there. +1 ;)

I really prefer to max E for the increased damage on the passive

No, don't do this. You want E max for increased harass damage on the passive.

You should max W first to get the most benefit from the shield, it will help your ADC in lane. Other then that, I don't see many flaws with this guide. Nice Job!

I prefer to use armor marks but I added "Other viable runes" section to my guide where I consider AD marks.
Ty for the suggestion.

Consider AD marks for the harass increase on Thresh's E.

Done. Thank you :D