Call of Duty on Wii gets quite tiring.
Honestly, the Wii is quite overpriced; sure it's interactive, but it's only fun if you're at a party (I personally prefer button mashing)
The Wii, simply put, is just a motion sensor and a cd drive. (By the way, the Wii-mote is quite fragile; my friends' Wii-motes broke when dropped from 3 feet) It's way overpriced at $250. If you have not purchased it, I would continue not recommending a purchase of a Wii.
Wait a few more months until Microsoft releases the new XBOX 360 (codename Zephyr), which will have physically smaller processors so they won't heat up (same speed as the original 360), they will cost less, and will most likely have a new design.