Q u o t e: I'm having problems coming up with games that is complicated and has been best sellers.
Define what you mean by complicated, and then maybe I can name you some.
Diablo 3 is moving away its RPG roots by giving players less character options to play around with. The game will be mind-numbingly boring. I played Guild Wars when it first came out and it used basically the same skill system that Diablo 3 will use. Except Guild Wars' skill system was more interesting because you unlocked skills by doing quests--or you learned them from rare monsters. Here, you level up, don't get to distribute anything, unlock tiers of skills, pick the skills you want to use, and then that's it. Then you level up some more, find more items, etc. That will be Diablo 3 in a nut shell. If a monk picks and uses the same skills as your monk, then you guys will basically be the same (and that will happen a lot). That's not a RPG. There will be no "I'm going to create a strength monk and pick these 6 skills," or "I am going to make a stamina monk and pick these 6 skills."
Q u o t e: Guides won't exist for PoE?
You're missing the point. You quoted a guy who said "DAT STAT SYSTEM IS STOOPID CUZ PEEPLE PICK THE SAME STATS AND DAT TAKES NO SKILL."
Well, just like with the stat system, people will find the optimal build for monks, demon hunters, etc. But that doesn't mean you get rid of skills entirely or you get rid of stats.
Q u o t e: Atm PoE seems to be encouraging usage of guides.
I hope so because I like games with depth.
Q u o t e: Fact is that d3 encourage experimentation and finding what suits you.
Yup, so does PoE, except in PoE you have more options to customize your character. In PoE you get to pick your skills, alter them with support gems, and spec your stats.