Admittedly, the only Call of Duty I've played is Call of Duty 4 way back in the day, and I didn't enjoy it very much, maybe I'm not the best judge on this one...
...but I picked it up on the cheap last week and it's pretty fun, for what it is. It still has the big issue of "I can't tell who's on my team." but otherwise it's fun, and I haven't even gotten into multiplayer yet.
No technical deficiencies as far as I can tell, and Wii Remote & Nunchuck is THE way to play.