many reasons
- button delay
- completely ignores AI fouls, never plays advantage, no penalties for player even with blatant, blatant fouls in the box
- nerfed tricks/dribbling
- nerfed through balls (WTF happened, agreed 2009 lofted through balls were overpowered but this is absolutely ridiculous how the slide rule pass is basically impossible)
- scripted AI (aka 'i wanna score' power mode) - yes make the computer play better by MAKING BETTER MOVES not by giving them a magic +15 speed boost that you can clearly see on the screem
- stupid 'passive' AI like waiting to receive ball by standing still and not running towards it, or how you win a header and the guy receiving the flick on stands there and lets it get stolen by opposition. Yes I know there's super cancel but it takes that extra split second to hit it and FFS why do we need it anyway, why don't you just LET ME CONTROL THE FREAKIN PLAYER I'VE SELECTED?
And the big one...
EVERY SINGLE COMPUTER TEAM PLAYS EXACTLY THE SAME WAY (ALMOST).
They all want to play like Barca, even low ranked 'get it in the mixer' style teams in real life, and even when its raining hard. Pass backward and sideways all day, never ever attempt a 50/50 through ball or make overlapping runs etc. Also since when did defenders do cryuff turns out of defence?!?!?!
Its really stupid and BORING BORING BORING. I can sit there and pass the ball amongst my defence for entire game and get draw after draw as well, but unlike the CPU I actually want to ENJOY THE FREAKIN GAME
Konami... are you listening.... PES2008: horrible. I said OK they're allowed a bad day. 2009: not so bad but still so flawed (esp lack of AI runs!!!). 2010: better but for every improvement (master league, more formation options, ball physics etc.) there is equal step back and the real problem - AI, both the 'passive take control of your player and you can't do anything about it apart from supercancel' and computer team style - is not fixed, and then on top of it all, you introduce BUTTON LAG what the hell!!!!!!!
3 bad PES in a row has been the last straw for many long time PES players (like me and all my friends).