PES5 does a hell of a lot of things better than the recent FIFAs... Also, I don't see any aspect of PES 2010's gameplay that is better than PES5's.
I still believe PES5 is the best football game available.
It doesn't even look that bad on PC when patched - In fact the pitch textures make the overall look better I'd say...
Here's why I think it's gameplay is better than FIFA's:
Good balance between defending and attacking - defending required skill, and the amount of action in a 10 min game felt right.
Responsive controls - the best example would be "super cancel", it was great in PES and I used it all the time, in FIFA it's unresponsive and just makes things more difficult most of the time...
Better AI - Defence and midfield hold their shape better than in FIFA, attacking fullbacks will overlap, strikers find better positions in the box for crosses... Marking is more realistic, you can't just pass to an open striker in the centre-circle for a counter attack all the time like in FIFA, especially if man marking is set up.
Sometimes there is a lack of movement but I don't think that's any better in FIFA.
More realistic passing - There were less perfect 180 degree turn passes, "ping-pong passing" was, although possible, difficult to get anywhere with as the ball would bounce about and be difficult to control or hit accurately first time after a few passes.
More realistic first touch - You can't just collect a blasted pass waist height with ease... Players would make mistakes and knock the ball too far sometimes...
Better refereeing - Penalties and cards could be given for standing tackles, and the amount of free kicks given was more realistic (on FIFA you can go a whole half without a foul...)
Better dribbling - There weren't a load of tricks, but it felt much more accurate to beat opponents with direction changes, wrong footing them etc.
Realistic shooting physics with various types of shot, you can also hit truly powerful shots (unlike FIFA).
Keepers with human-like reactions who can be beaten by the pace of a shot, go the wrong way, come and collect crosses, catch the ball at their back post and actually make the odd mistake. FIFA keepers (and shooting) are too predictable, making you know where you can and can't score from.
Far superior in-the-box action - You can create space inside the box without having a defender steam in and barge you off the ball, crossing and heading/volleying is so much more convincing (just go into free training in PES5 and put a few crosses in and have efforts on goal, then do the same in FIFA... you'll see that it's terrible on FIFA).
Players would throw themselves at the ball, you'd see them actually missing the ball at times when they had to stretch, or attempted diving headers and overhead kicks (on FIFA, contact is always made with the ball...)
Better set-pieces - You could actually cross properly from free kicks and corners, as well as the free kicks at goal being (although a little too easy) more realistic with more depth of control.
I could probably go on, but I'm starting to feel that this post is getting too long

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I still play PES5 from time to time, and although the gameplay always impresses me, I have to admit I do miss the ability to play the ball into space that you have from manual controls.
It pisses me off that all the stuff mentioned above can be done well on such inferior hardware on a 5 year old game, yet it's been fucked up on much better consoles.
Absolutely no progress, there's been steps forward in some areas (such as animations and freedom of control) but so many steps back in others.