So guys, yesterday I had 2 more sessions with Demo 2 and I got more impressions.
Firstly, it's still way waaaaay better than PES 2012. I mean, the game is addictive again! Finally, after that 2012 fiasco. This is a good sign, I wanted to keep playing all night.
But now let's talk about the problems. There is a small dose of PES 2012 in this Demo 2 unfortunately. I was playing all matches on Top Player level. I must say that in Demo 1 defending was much better. Massive centre backs like Pepe were really "felt" by the opposition, there was a sense of collision and CPU attackers didn't find it too easy.
But on Demo 2, there's a lot of waltzing past my defenders again, and the player controlling the ball can do those quick stops and turns and wrong foot our defenders so easily. This can be done by the CPU with ANY player - be it Messi or Castolo.
The game went back to being a bit flat again, as someone mentioned earlier. Player individuality/skills/limitations aren't so noticeable.
The "ice skating" effect is back unfortunately. Our defenders feel so much more difficult to manouver than in Demo 1. They feel very slippery again. This reminds me of those horrible physics on PES 2012, where any Average Joe could do a quick stop with R1 and your defender would look like a truck on the loose and take 3 or 4 seconds to turn.
But in other aspects Demo 2 is more polished. Goal keeper's deflections now feel much more right now. Passing is better too.
Shots were toned down a bit too much. It's not disastrous, but sometimes I feel they could be more poweful, especially the ones hit with R2 (the ball goes too floaty for my liking).
To PC users who can't play Demo 2:
I can only imagine your frustration, but bear in mind that Konami will change a lot before the final release. I think previous experience shows us that those Demos don't reflect the final product - I think Konami just use the Demos to get user feedback before they can cock things up for the final version

I still want to see the final release before buying it. I'm not trusting Konami right now.