I know there's been a certain amount of scripting in all PES games but I have to agree that the scripting in PES 2011 is by far the worse!!
I noticed that after winning 4 or 5 games in a row on Masters League I always have a game where my players have no energy and make atrocious AI mistakes.
I had the perfect example at the weekend: I'd just picked up 10 points from the last 4 games and beaten Liverpool 4-1 and then I came up against Bolton. Right from the first whistle my players were soo slow and I went behind to an own goal (suspicious). I got really angry and was determined to get an equaliser but just couldn't get any sort of rythm going. The worse thing was I knew Bolton were going to make it 2-0! There was a period where I couldn't get anywhere near them and as they came forward my defence parted like the red sea and they scored a screamer from 25 yards out!
I felt like smashing my controller up and snapping the PES CD in half!!! I just find there are certain games in PES 2011 where the computer has already decided what's going to happen. No matter how well you play your defence will go missing and gift the opposition a goal. And then all your players suddenly lose all their energy so you can't get back into the game! It drives me mad!!!
I see your point mate, but in my ml on top player, i've won 10 matches in a row several times, and sometimes went for 15 consecutive matches undefeated.
About the scripting, i'm a bit confused.
I honestly don't think they make a football game and install some kind of script/cheat-factor in favor of the cpu team. All though i have seen some crazy things in my time since the iss pro days - Players having around 70 in speed easily chasing and taking the ball from my player with 85-90 in speed. Or a 170 cm player easily winning a header against koller or an other tall player.
But on the other hand as i mentioned, i've often tried winning 10 consecutive matches or playing the ball around controlling the entire match without the cpu team getting pass the half way line more than a couple of times or me having 89 % of the ball possesion (playing as ifk goteborg vs chelsea).
So in my opinion the "scripting" goes both ways. And to be fair, it not only happens in pes but also in F**A...