For me there were two option ever to play FPS or any kind of shooting games: PC and Wii. I don't care how amazing the graphics, the story, the characters, etc in any game. From the N64 trough Xbox to the PS 3, on every consol I played, except Wii, FPS sucked for me, but it's only my opinion.
I have CoD World at War, and my fiancé got the remote out of my hand, when he first saw me playing. Until that he was a complete anticonsolist. From that on, I cannot play CoD on Wii, when he is here, because then HE has to play it on wifi. >.<
If you want to play with a zapper, then you have to know, it was only good for me for shooters, where you don't have to control your character, you only shoot.
I'd recommend you to always watch some gameplay videos on Youtube, before getting a game (either buying r downloading, lol).
Some of my personal favorites (I dunno what kinda stuff you love so I tried to gather more kinda things):
Endless Ocean (No point, just relax and swim in the ocean, get to know animals, gathering items)
Raving Rabbids(hilarious minigame collection, including shooter games with the famous plunge gun)
CoD World at War
Monster Hunter Tri (amazing RPG, playable both offline and online, amazing places and monsters, which look like dinos)
Zelda Twilight Princess (again amazing RPG, filled with both action and hard puzzles inside dungeons, a must have if you love RPGs)
Tales of Symphonia (jRPG, filled with nice anime video cutscenes, one of the famous "Tales" games)
Star Wars Force Unleashed (ONLY if you like butchering and butchering in only one direction AND you really like SW else it sucks :-D)
Battalion Wars 2 (hard control, but if you learn it it's nice-somewhere between strategy and shooting games, you can control flight, water and ground units, on and offline)
Excite Truck (NO reality at all. Huuuuge jumps, big crashes, rings in the air, trucks turning 720 degrees in air. I hate car games, but this one rocks

)
Super Smash Bros (what else is good than hitting all those cuuuute and annoying characters hard in the head to make them fly away? :-D)
That's all for now. Hope I helped.