Your taste in games is frankly,.... well it's what I'd expect guys to play, it's sports and MMO's for goodness sakes, while yes some girls play and love these games - the odds are WELL against you.
It's time evaluate yourself and your gaming future if you genuinely want your wife to get into it. My recommendation, which I hold in high regard no less! Is that you look at picking up a PS3 and actually just 'making' (letting?) her watch you play some vastly more story focused single player interesting games. Uncharted 1,2, 3 and Heavy Rain are absoloutely and utterly perfect examples of games which could at least convince a non gamer "hey,... golly.. maybe games aren't completely fucking stupid childish crap" because to be honest, that's what a lot of people STILL think about gaming.
Well you could consider letting her play for a bit on those games while you play. Pass her the controller for a bit while you grab a drink in the kitchen or go to the bathroom, or just say 'here you try'
As for the games you should play once you've got her interested? I can't recommend Pixel Junk Monsters enough, it's an incredible game, the demo is free and coop works on it - try it.
Finally as someone who has dated several non gamers, the simpler games often are the best at the start, Mario Kart, Mario Golf worked for a fun afternoon also.
You need to focus on a fun and easy experience to make it easy initially.
Do not even consider MMO's for a very long time and try subject matter which is likely to interest her, some sports games might be ok in coop (I don't know) but I imagine the brain would switch off the second you pull out a sports game in most cases.
Embrace storyline focused single player gaming in general, it's good for you.