The Ghost of RubangB on 27 December 2008
I actually recommend Red Steel, even while knowing it sucks. It's super cheap now, but if it's still not cheap enough, rent it. You can beat it in a day or 2 depending on your schedule. It's hilariously bad, but I liked it 'cuz it reminds me of a lot of my favorite so-bad-it's-good 80s action movies.
Wii has tons of shooters that are on-rails arcade style with great co-op, like House of the Dead, RE: Umbrella Chronicles, and Ghost Squad, or the Nerf one, if you're into the rails.
If you want a mysterious sci-fi shooter/adventure/puzzler quest type of game, get Metroid.
If you want an online fragfest, get Medal of Honor Heroes 2.
