To repeat what others have said, PES in 09 and 10 didnt do much. If anything they went back a step. I have been a PES fan forever so with that said I feel it was still better than FIFA!
2011 has made major improvements! The demo is 9/10. There is a lot of room for improvement still but for the first time since PES has arrived on the PS3 it has finally made a massive move forward!
Heres hoping online gets good! fingers crossed.