I think the lack of any standing offerings of variations of Quake is a glaring mistake but easily rectified. :)
It's really heartening to see lan gaming continued and offered in such a way that the amount of hassle and setup is minimized and the gaming is maximized. We spent far too much time in the 90's and 2000's dealing with driver issues, etc etc. Bravo.
New ways to exploit the physics to do things your opponents don't expect and can't easily reproduce. As the skill level of regular players increases, I always look for new ways to approach the maps.