Just about all the good ones.
The only exclusive I've enjoyed long enough to be worth the money is Castle Crashers. But that's soon coming to PS3
Yes.
New posts: Nintendo makes games for a casual audience. Not specifically kids. They're appropriate for kids to play, but adults and older people can still enjoy them just as much as children do.
We could say the same for Pixar. They make movies aimed at kids, but adults still like them and watch them.
Just because you're 18 doesn't mean that you have to watch horror/researcho's all the time.