I'm a pretty well experienced player, easy to hangout with. My preferred games are: Pathfinder, 3.5, and Apocalypse World. I'd like to include others in that list, but those are the only ones I've ever been able to play :/.
I've never GMd before, though I'd really like to. My main problem with PnP games are the people playing them, or at least, the ones that aren't willing to dedicate themselves to the group.