I can only assume it will be pretty good for those that haven't tried out any of the previous Call of Duty games yet (be it on PC, PS2, Xbox, w/e). I've played every Call of Duty available on PC, so when I got CoD 3 for the Wii, I set my expectations very high for it. I'd say the IGN review of Call of Duty 3 for the Wii is pretty accurate, it's fun once the Wiimote becomes second nature, but I wouldn't mind going back to the PC (sidenote: CoD3 is not available for the PC). Overall, in my opinion, Call of Duty 3 is more of a "go rent it and see what you get" than a must-buy, while I was playing it, it made wonder how much fun I probably would've had if I had bought Zelda instead.
Edited to be a coherent rant than just a rant.