I agree with a few of the above comments. I never go too much into detail about scripting because I feel, like many have said, that the CPU MUST use something to actually make the game pan out.
Where people's frustrations lay is the seemingly impossible game to win, the one that is SO heavily rigged that it beggars belief. This used to happen a lot on PES 2011, where for example you would be wining say something like 2-0, 3-0, from the first leg in a specific cup, and the CPU would immediately generate ways of scoring like three headed corners in a row.
Likewise, yesterday for example I won two games in a row, one an easy 4-1 victory, and the seconde a close yet perfectly feasible 2-1. Then onto a cup game....which is where I start getting nervous. Played home as Liverpool v QPR, all my players on great form.
Went one nil up, then two nil up. Then the scripts started kicking in. It was as if the CPU had said right 'fuck this' this game is GOING to be a thriller. With their first shot of the game they hit a deflected goal. You know, one of those rubbish ones. They then had a corner which was headed in. Two all. I then went three two up with an incisive move that the CPU did it's best to stop, with two rebounds off the keeper before a tap in. During this section of play I missed two one on ones and hit the post.
They then scored an unbelievable goal in which I have saved if anyone is interested. They hit a long through ball (lofted) from a central position toward the corner of the 18 yard box. My defender who began to chase round and fetch it suddenly stops triggering some sort of auto trigger from Reina who starts to come out, but kind of goes at this weird angle. Needless to say the QPR man wins the chase. A collision ensues between the player and Reina in which the ball bobbles free outside the area, now Reina had enough time to run back into goals if he wanted as by now I had enough cover to at least slow the game down, but as the CPU pass the ball infield Reina goes charging towards the CPU guy outside the box about 20 yards away. Needless to say the CPU then hit a 15 yard slow shot into an empty net. I was like WTF.
Now you could say these things happen, you could say it's life and get on with it. I don't necessarily have a problem with that. Where my problem derives from is that THAT ONE GAME, that ONE FA CUP v QPR, was absolutely destined to be a high scoring loss thriller with all sorts of shit going down. I could feel it through the gamepad from early on in the game.
The problem people have is WHY DOES THIS HAPPEN, when people are having perfectly good games without scripting and weird shit happening anyway?!? I didn't win a game in three the other day, but did I complain? No! Why? Because they were perfectly realistic losses. A) I didn't play well enough in the three games and B) the CPU goals were perfectly varied yet feasible.
You can just feel it.
There was a Europa game I played last week, where the game was decided before a ball was kicked. This crappy team scored three of the most scripted screamers you'll ever see, included the old scripted lob into the box where my Carragher couldn't outmuscle some little striker twice and ended up shelling two cushion headed setup goals.
Now I'm no expert, but either the scripting or whatever was soo subtle in PES 5/6, or I was young and naive. It may be the latter.