15 years ago my friends and I were playing daily. Our clan, the ICC, were regulars and for a while the strongest on one of the main EU servers (PSL: Premier Sauerbraten League). So many memories of that game, and the LAN parties.
It's incredible that there's some people still playing. I boot it up once a year, it's always like returning to a piece of my youth frozen in time :-)
Heck yes, I love this game. Instagib is very satisfying, and I have many memories making maps with its embedded level editor together with friends.
I don't know of any other games that do this, having a realtime multiplayer editing toolset. (if you do, tell me and I'll certainly play them too!) Maybe Halo's Forge mode, but that's a bit more limited, though still good fun.
But I do not play it anymore. I fear it would become too addictive again.