The nexuiz engine is pretty fast with lower settings and you can play it with older gfx cards too. The gameplay is not too fast - when you are used to UT3 then it is slow I like the standard deathmatch from time to time, some maps are really inspired by some Quake maps. I played it for some time until I discovered Zero Ballistics. It is still fun, but I like tanks, maybe add those as special *g*