I went to George Mason for my undergrad. The faculty is pretty great and I made many good friendships and connections with people who went to GMU for their MFA (even though I was an undergrad at the time). Lot's of book and lit stuff to do because it's close to DC, plus GMU and Fairfax host a pretty big book festival in the fall. GMU also homes the headquaters for the AWP- fun fact.
The area, as many have already stated, kinda sucks. It's right in the middle of the suburbs. I loved GMU for the people, but hated the location.