what many people stops to have a further look into nexuiz (after they tried it) is the bad performance. not all of them had the "prejudice", knowing that nexuiz came from Q1-engine and they did not expect Q1 alike performance, but the performance they got was too weak. I don't have well performance either (e.g. on FFA) because I have an ATI card, although this (using ATi card) should not be an argument (for commercial games it is usually no argument or limitation at all). So optimizing the performance for maps, models (by redoing them) and the engine in general should be the most important thing at the moment, beside finally getting CSQC to work (which will help to improve performance additionally).
Once Nexuiz runs better I'm sure that more people will play it, and the people who play it now are the ones who don't care playing with 20 FPS (that are the ones who play with 12+ people on a 1on1 map, where I do get massive frame drops as well, so....)