Call of Duty 3 is a fun first-person game, disregarding some minor and major flaws that are presented throughout.
Obviously, in order to aim, you point at the screen with your handy dandy Wii remote. This works quite well, however, the Wii motion controls may be a hit-or-miss with many gamers, but if you have a problem with those, then it's not Call of Duty's fault.
In terms of visuals, they are quite alright. There is nothing particularly special in the game, however, as far as I could tell, there were no visual quirks that hindered the gameplay either.
The thing that will tick nearly every player off, however, is definitely going to be the lack of multiplayer. Call of Duty has always been known for its exquisitely popular multiplayer suite that is included with the less prominent single-player campaign, and the fact that the only game you get with Call of Duty 3 is the single player game, which is short to say the least.
Overall, you would be best to stick to the PlayStation and XBOX versions of this game, but if that isn't an option, Call of Duty 3 is definitely worth checking out for the Wii.