This isn’t really an MMO — though it does have the capability of being multi-player. Torchlight II is a Diablo-style isometric third person shooter, set in a fantasy realm. There’s a veneer of missions and story, but really it’s about going around and hacking / slashing / shooting / blowing up various bad guys Real Good. Plus you get a pet. The characters are somewhat customizable, and it’s generally fun. There’s a free demo that I’ve gotten multiple hours of playtime from, so you can certainly try things out. The networkable version requires all of $20.
I can see Margie and me buying copies of this and duoing up to just do mindless combat now and again. But it’s not what I’m looking for in a more interesting MMO.