If only Mario Strikers Charged was launch game. I'll choose ExciteTruck too, the game just looks fun, big jumps, cool locations, Turbo speed, etc. The more i think about the whole concept of Wii as "we" strategy i think Nintendo is gonna really live up to it.
Just look at all the multiplayer driven games that are in the pipeline. BWii, Mario Strikers, potential Mario Kart, Smash Bros Brawl, etc. I think the Wii Generation will be the Multiplayer generation, i know i won't be spending so much time playing single player.