Scripting is a funny issue, a lot of it is in the mind. People let in a weird goal, miss a few easy chances, then get all hot under the collar, and it affects their game to the point they lose a game they should win, and blame it on scripting. I know I've felt that way before, but I can always look back and think, well actually, I did try and dribble it out of defence instead of clear it, or something like that, generally bad play.
I even hear people on other forums I browse claim scripting online, madness. Again, and this has happened to me, I generally if i am honest with myself lose to a worse team/ player, if i got 1-0 down, enter panic mode, get all pissed off, and then nothing is bound to go right. It's easily to blame it on scripting, which for me is the lamest argument of the lot, period.
Offline the game does need to balance itself slightly, but playing pes 11, and in general the series, I've never ever seen anything that's really pissed me off to the point that I beleive I was completely cheated.