I've come to the only veterans i know of....

[Mr. Lothario]

     We had a couple guys play the shit out of it, but speaking for myself, I averaged ~10 FPS in enclosed maps, going down to ~3 in most maps. So it was unplayable except in maps where I could get very far away and snipe with my binoculars at a very small area (it would take me something like ten seconds to rotate my view 90? in those situations, so...). Naturally, I didn't play it much.