Movement needs a tiny touch to make it as satisfying as Quake 3 - its fast and smooth as hell to be fair even with everything ramped to ultra and they seem to have taken some effort to make sure that ultra settings have as good visibility as lower settings so less reason to drop them unless you have a slow system.
I just jumped in first actual game playing - did 21 versus top player at 25 (who were higher ranked or whatever) and had least deaths, was pulling off loads of really nice air rockets, etc. had a blast and that was with not really having much figured out/setup properly.
Looks like skill wise it will scale nicely but not be inaccessible to casual players as well - found the cheeky voice overs, etc. kind of fun - overall I'm impressed.
Think I actually played better than my last serious quake live game - aim was a bit off especially due to needing to get the mouse settings tuned in a bit but seemed to be playing a bit better with regard to positioning and self preservation possibly due to being aware I had no idea what was going on :s 20 seconds in though bam back in the zone in terms of flow and so on.
EDIT: "Netcode" seemed pretty tight - though I had like 13ms latency so not really surprising - not like BF4 which is a shower of **** for me, was one player lagging a bit which occasionally made them hard to hit but nothing terrible - overall pretty consistent with good registry.