i love descent, and i love that it's now software libre. i hope the guy who maintains d2x has stopped being an idiot by including patched versions of standard libraries such as libsdl without providing an option to replace them and forcing the patched versions to overwrite pre-installed software, but yes - awesome.
the thing about descent was that it was the first game with 6 degrees of freedom. i actually bought a special joystick that was capable of dealing with it (one designed for flight simulators) and after 2 to 3 weeks of practicing i was competent at side-motion circular slides firing at a target at the centre. the first 2 weeks were spent mostly getting motion sickness and having the nose of the craft bashed against a corner :)
it was also fun to watch spectators swaying from watching the screen! but, again, after a couple of weeks you got used to it, both as a player and as a spectator.
yeah - to those people who set up LAN parties: i hear ya :) i did the same. i think the lowest spec i got away with was a 486 SX 25 with 12mb of RAM, setting the screen to 320x240 and it was just about tolerable. i had to use 10-Base-T with terminators for goodness sake - what the heck i was doing with 5 networked computers in my house back in 1996 with just a 28kbaud modem i _really_ don't know!
so yes, absolutely: descent (the software libre version *or* a commercial version) gets my vote... *as long as* it has a community portal similar to that of Dark Reign, with a chat room so that people can meet other players, set up a match and play. that is bizarrely what's missing from bzflag: although bzflag has an in-game chat it doesn't hatve out-game community chat, very odd.
also, it would be awesome to see planetary-surface action as well, not just in mines (no matter how large). i always felt a little claustrophobic and the attack vectors would be very different in free space... interesting to think about the possibilities here, hmmm :)