Hah, the unguarded NCR version - noobs can't get in, hell lot of a campers and PKs, All traders are dead, The inner part of city half-dead. It was lame.
It was fun, it's like quake arena, but with witnesses standing at bazaar.
Lots unknown people who don't shoot each other even if they don't know each other, because they know that one gang can come and kill them all, so it's useless to shoot at random people if you're not part of that gang who going to kill all.
You'll never see so much alive people at any other unguarded town, and you'll never see someone who you don't know don't shoot at you only because place isn't guarded.
So it was some kind fun, but unfortunately in few days there will be no more bluesuiters and it'll be simply dead place, probably.
Also inner city was really cool, exclude one thing... if you shoot at city-raider gang from there, guards backstab you ^_^ because guards didn't saw attackers shooting someone, so they still protected, so you have to wait till attacker shoot you/cop 1st, and only then help cops to shoot attackers.
Irony that at unguarded NCR I was dying more from guards who were running out from inner city than from players, or from players, but I was running away from guards at that time.