I am looking for a good one for my girlfriend and I to play. No idea how to size one up. What do I look for?

Inbe4:
Free
Good
MMO

Choose one.

Lord of the Rings online is supposed to be really good. Maybe try giving that one a shot? DC Universe online isn't too bad either.

APB: Reloaded is alright. I played it for a good five hours before I got bored, which is four and a half hours longer than I've stuck with any other free MMORPG.

i used to play runes of magic a lot, i use to be fun but they get to the point that they become so addictive that you just have to stop playing

Inb4 Exo:

Selfless link for Exo; http://www.gamesas.com/topic/1331207-allods-online-its-free-and-you-need-to-play-it/

Heard its not terrible. Gameplay videos make it look entertaining enough.