My girlfriend loves Call of duty 4, even though shes pretty bad. Anytime I sit down to play she'll join me and we'll go round for round. I don't mind, because I get to play it more often without her nagging me to do something else.

I recently picked up Fable 2, and she loves it. Has her own character with like 4 husbands. Doesn't care for the questing stuff, but loves the social/economical aspect.

She's also really good at the blacksmithing, so she raked me in a huge amount of cash (i got bored in about 5 minutes doing that crap) just because she found it fun.

Also plays guitar hero, lego indiana jones (less "nerdy" to her then star wars), the simpsons game, scene it. I picked these up for relatively cheap (minus GH...) and they are relatively fun games that you can play with her. Lego games are actually pretty entertaining, and great because there's no real way to "lose".

Before we were together, she played the Sims and Harvest Moon. Hated "gamers". Now she plays almost as much as me.