Placebo effect mate!!! or maybe you changed the way you play the game slightly!?
As no single stat was changed in the recent DLC, just as it said on the tin - new kits, new boots and roster updates.
Its quite weird though. recently my PS3 suffered the Yellow light of death and had to buy a new console... after id recopied all my data across from the old one, playing PES felt brand new, i felt better response, more fluid game play etc and as a result am thoroughly enjoying my ML campaign at the moment whereas before, on the old console was considering giving up on PES 11.
Make of that what you will but i severely doubt it has anything to do with the new DLC. As i said I am enjoying betetr games and I havent even updated to the new DLC yet.
I don't think it's placebo cause I was playing PES 2011 nearly every day before the DLC-update and thought all the time it was an ok-game, nearly good but far from great and a day before the update I played with Barcelona and Real Madrid and they were nothing like their real-life-versions.
But bam right after the DLC ( the game asked me if it should update stats, I said yes cause I didn't use any downloaded OF's anyway and didn't tinker with the stats before so..) the game felt different, way different, not the animation-transitions, the inferior physics but the flow of the game got better due to better control of the players, I can now dribble real nice with most of the players and they can hold on to the ball better.
With these improvements Barcelona mutated into the tour-de-force it is in real-life and Real Madrid plays very elegant now. And even smaller teams, though not as elegant and strong as these, play now better, their players can dribble better...
The best thing though is that I feel a joy with the game right now I never had with it before and that I never had with Fifa 11, that I think is superior due to better animation/physics/awareness..
Konami changed something with the dribbling and control of the players, probably just the stats of the players but it worked wonders, highly enjoying it with widecam and normal long at speed -1 and top-player on xbox360.
If they could fix the animation/physics-engine, put in more aware AI (espescially with the goalkeepers and regarding loose-ball-situations) for PES 2012, it would be pure bliss.