I can link you to the E3 demo gameplay. It looked amazing. You should buy the first one regardless of the flaws. The gameplay in the first one got repetitive (Ex. Missions that involved PickPocketing letters over and over, beating info out of people... over and over... and sitting on a bench and eavesdropping on people... over and over) But aside from that it was almost a masterpiece. As for the AC2 Gameplay>>>
http://www.youtube.com/watch?v=m9jIgLnQOSo&feature=related