I own all three consoles.
The Wii gets the most playtime because of SSBB, Mario Kart Wii online, TP, Okami, the VC and my backlog of GC games.Buying Klonoa in a few days.
The Xbox 360 has an uncomfortable controller IMO (I have REALLY big hands), but I play Halo 3 religiously and have been playing Kameo and Forza 2 lately. Downloaded Banjo-Tooie, will be playing that over summer break.
The PS3 is played the least, as themain reason I bought it is to have a Blu-ray player. The onlygames I have for it are LBP, Uncharted and Street Fighter 4. Waiting for Tekken 6.