I personally have no issues with the PES keepers for the most part. I play this game to death and the amount of instances where a keeper makes a silly unrealistic error is very minimal at worst. Keepers dont hold pile-drivers from close range, and even in PES 2011 they parry the ball out of the danger-zone for the most part.
I think some people have accepted that Fifa's superkeepers are the norm. They arent, and they have always been a massive issue for me. They are far too good, far too scripted to the point that any unpredictability with regards shooting from distance or certain areas is completely lost. In saying that, I adore the keeper animations in Fifa, they look absolutely superb, and are varied and relevant. But all this falls down when their telepathy skills kick-in.
You do get the odd silly moment in PES keeper-wise, but for the most part they are solid and react very well.
The most outstanding aspect of the PES 2011 keepers, and this was also apparent in the last few versions, even when they were spill-happy, is the fact they are completely unscripted. By this I mean, they react to the flight of the ball, and not the pre-determined destination of the ball. For example, if a player strikes the ball from outside the box, and the keepers view is obscured, he wont dive or react until he recognises the flight-path. Alternatively, if he see's the flight-path early, and the ball takes a deflection he cant realistically adjust, and he doesnt. I've seen this happen so many times and it does literally blow me away. To program the keepers based on what they can see from their respective position and line of vision is simply amazing in my book. I like nothing better than seeing a keeper react late when a shot is coming through a crowded box. Using the replay feature to give you an insight into what the keeper can see and when is brilliant. I suggest people try this, I have never heard anyone on here mention this before, it's very clever stuff and the exact opposite of how Fifa keepers seem to be programmed.