I have played on all consoles for a reasonable amount of time and have come to the conclusion that the PS3 is way ahead of the others.
Wii = Fun with friends for the first week before you get injured wrists.. then gets boring and painful to play.
360 = Some good games and average graphics.. lots of lag, rubbish cooling design/quality of build.
PS3 = Pretty good qaulity, well built, finally some good games and a classic name.
PS3 is the winner for me.. and graphically, whatever people say("OH the 360 and the PS3 are the same") the graphics on the PS3 are noticeably better.