Well, it's sadly the only thing I play on the Wii. Maybe when I get off my lazy but, I'll start getting some great Nintendo titles. But other than that...yes Conduit 2 would have to be the game I've played the most, and it's been amazing! I'm still amazing how the game has survived this long. Well, I guess I shouldn't anymore. Wii has it made!
If your talking Hours, definitely Metroid Prime Hunters, but if your talking currently, I would have to say Tribes:Ascend, its an awesome free PC game, without adds, and your don't have to pay money for weapons. Holly crap, this sounds like an endorsement (if I was famous). Also Conduit 2, obviously, and in Elementary school, Pokemon and MPH (listed above)
[G3] Razor I play Conduit 2, and own a Wii and 3DS.