My online FPS.
The Conduit, best FPS I've ever played, definately best on the Wii, sadly pretty much dead, hard to find a match, last players that may offer challenge are on FFA teaming and glitching jerks. None of the glitches were something you couldn't deal with if you were good, but if you weren't then the rapid fire Smaw and pistol were nightmares
Conduit 2, Epic Fail, terrible attempt to copy CoD mechanics, ruined the serious/darker spirit of the first one, still had same kind of glitches and ruined every single weapon from the first one. REGION LOCK WTF!?!?!?!?!?!?
Black Ops, decent FPS, but not real challenge or competition for my taste, the "pros" were the ones using Famas, Aug, rapid fire/silencer 74u. Very annoying community, best thing was the zombies even though the mode had too much idiots who knew nothing about what to do or just refused to open the doors etc.
MW3, first it was awesome for me, I loved how the pistols were so awesome compared to BO's, also liked the specialist and few new guns. Terrible weapon balance, full of hackers, glitches...
There just isn't anything else for Wii, well there are but mostly dead games by now, there was this some Paintball shooter, but I believe that it's pretty much dead game as well.