Metroid Prime 3 or Mario Kart Wii?????

[TWRoO]

That is one freaky Mario avatar you have there.

I haven't played MP3, I hear it is excellent, but Mario Kart will last ages, in the past 2.5 months I think it has caught up with the other two games I had played to death, LoZ:TP and RE4:Wii (both around 180 hours)