I would say give it time.
Nintendo so far has a big collection, but not all of them are targeted to the audience you fall into. When you look at 360, there are no games like Cooking mama, Raving rabbits, Pokemon, My Sims, etc ; games that are for teh younger teen crowd. A vast majority of the games for 360 or PS3 are games that more mature gamers (late teens and up) would go for. Games like Gears, Halo, Fable, all the racing games, Splinter Cell, etc.
It seemed to me that Wii had a slow start too, then I realized that the number of games for launch was actually pretty good, it's just that I wouldn't play most of them. But now we have Zelda TP, MP3, MOH, BWii, Guitar Hero, NFS, Red Steel 2 rumored. More games that will likely appeal to you are definatley on their way. Just don't be too quick to ditch the Wii.
Sure it kinda sucks for those of us who want some bad-ass big war violent games, But as far as Nintendo goes I think it was a good choice for their business. Starting with a good mix of demographics.