3 more I'll add to Atreides post:

Metal Slug Anthology - If you're a fan of shooters like Contra you need to get this for your Wii. It contains Metal Slug 1-6 and the enhanced remake of 2 (Metal Slug X IIRC)

Punch-Out!! - Reboot of the NES classic, pretty fun although a bit hard with the motion controls. Just play classic style and you should be fine.

Trauma Center: Second Opinion and Trauma Center: New Blood - These are similar to Trauma Team but with just surgery and nothing else. Games are a bit tougher than Trauma Team (especially New Blood since it's difficulty is pretty uneven) due to a time limit and other things. The sci-fi virus thing can get a bit annoying, but if you liked Trauma Team... these are great to. Although they don't have the suspenseful/emotional impact the Trauma Team story had.