Wii games are generally made for kids and casual gamers. My son has Star Wars Light Sabre duels, which sounds cool, but its pretty lame. The only game that holds my attention for more than 5 minutes and is fun to play with others is Guitar Hero World Tour, My BIL has just about every version of Rock Band for another platform and its fun too.
There's a Cabela's hunting game, I've only played it for a few minutes in the store, but it looks pretty good.