In the evenings 1/2 servers are filled really well most of the time. Two days in the week there are draft games/cups which fill up atleast 2/3 servers extra. It definatly not trash but since it's beta it does still need some work ofcourse.
If I remember correctly both the Quake Wars and Brink release clients were almost exactly the same as the last beta clients, so don't expect too much change.
I was in the alpha and in the beta, and the amount of things that have already changed in those is enough for me to trust them to not make those mistakes again :P
filled in the beta form, no luck so far
Extraction bèta forum that can maby give you some extra fps.
got a 6 years old computer and game is running decently (better than brink), got some fps drops tho but its alright