My wife has never been a game player but because she loves me, she has consented to me trying to find something she enjoys. Here's the first results
fusion frenzy - xbox: meh, just about tolerates sumo, but too many different things going on
Mario Kart - Wii: wife approved. Simple controls, fun gameplay, sensible learning curve, co-op mode
Micro machines - PlayStation: the fact that the car turns when the camera doesn't, so that left can be right or up or anything at any moment makes this quite confusing
Tekken 3 - PlayStation: the Tekken ball volley ball sub game is very much wife approved. Simple controls, not too difficult (if I play as gon) contains farting dinosaur and allows wife to kick husband in the face