Well for starters, you could definitely use more Metroid in your diet. Get Prime 1 at least, and if you're hungry for more you can track down Prime 2.
If you want stealth/action, you could get Metal Gear Solid: Twin Snakes for GC. Soul Calibur 2 is probably the best fighter you can play on a Wii right now, after the Smash Bros franchise, of course. And if you want some creepy horror/survival gameplay, look for Eternal Darkness and some Resident Evil games.
Moving on to Wii software, I'd recommend Boom Blox, No More Heroes, Resident Evil 4 Wii (the definitive version), Godfather: Blackhand Edition, and Trauma Center: New Blood.
Oh, and if you like ruthless strategy games, try Fire Emblem out. Probably cheapest to try the GC one first and grab the Wii one if you like it.
"The worst part about these reviews is they are [subjective]--and their scores often depend on how drunk you got the media at a Street Fighter event." — Mona Hamilton, Capcom Senior VP of Marketing
*Image indefinitely borrowed from BrainBoxLtd without his consent.
