I'm now 20-30 matches in on the PES demo (prob 50-100 with FIFA, sorta lost track!) and I have yet to see any shocking keeper gaffes. The only goals I've given away that annoyed me were floaters off free kicks but those annoyed me more cause of the weightless ball physics. I've also scored a couple through messy goal mouth scrambles. Honestly, I don't see the major issues some people are reporting with the keepers.
An interesting thing is happening though: the more I play the PES demo the more I'm really beginning to enjoy it whilst the opposite is true for FIFA - the more I play FIFA the more I see the same old ailments and the more frustrated I become. At first I didn't think I'd be able to overlook PES' shortcomings but yesterday for the first time I began to see myself possibly playing PES more than FIFA this year.
Dryzer, you say you don't see the realistic AI which surprises me, what exactly do you see that isn't realistic? Some people say off the ball movement isn't as good but I disagree - it's just different than how it's done in FIFA and takes some getting use to, but in many ways it's more intelligent, subtle, and sneaky! Also, watch for things like how well the defense keeps it's shape, something lacking in FIFA.
I know everyone has there own opinion but to say PES is a very flawed game I think is quite harsh and makes me wonder whether you've given it enough of a chance. I know accessibility is itself considered a positive by many, but I really don't think it's wise to pass judgement on PES until you've played a minimum of 20 matches, especially if you're coming from FIFA. Maybe you've played that many but it's hard for me to believe a football fan could spend that much time with the game and come away with your impression.
I'm not saying PES is without its shortcomings, but IMO they are mostly superficial and not many are football related. Meanwhile the opposite still seems to be the case with FIFA. I'm really hoping that with a few tweaks FIFA 11 will be great, because when it is fun and not a frustrating unrealistic back and forth tackle fest it really is awesome, but I would recommend having more patience with PES because it too can be quite the football game.