Well I think if you have played the previous version of PES, there is not much difference from 2009 and 2010. I could be missing more of the detail features of it though. About the graphics: It is really amazing for being in a handheld. Country selection virtually all countries are here included. I am (on the video above) playing here as USA. vs Mexico.
I used the remote joy lite to make the video and so it might seem that even though the video capture is good, there are some frame skips sometimes. Just note that the gameplay is much smoother on the actual PSP than shown on the video. Overall, Pro Evolution Soccer 2010 is great. I am not a big sport gamer, but do enjoy the game much.