this is not a recommendation. from what i can observe at the counterstrike cybercafes, d_dust must be an insanely good map… ugh.
The way to play on blood gulch is with alien guns and the warthogs. The only way to kill people is by hand-to-hand, grenades, or the gun on the warthogs. Wow does that board suddenly become insane.
Anyway, back to your regularly scheduled thread.
Personally, I’m fond of the Dredwerks, from Quake 3. Big and roomy (at least for Quake 3), a lot of side passages and ways to sneak around, and a little of everything (all the weapons, most of the powerups).
And I like sniper maps, in general. There’s nothing “cheating” about sniping; if you can do it, then so can your enemy. And in most games, there are more ways to dislodge a sniper than just another sniper (the lock-on feature of the rocket launcher in the Unreal games, for instance).
What I’d really like to see, though, is for someone to make Escher’s Relativity into an FPS map. Gravity would of course depend on your frame, and those closed doors would map onto each other. Does anyone know if any of the current games are technically capable of this?
There were a couple of stabs at it in Unreal Tournament/Unreal. Mostly just novelties, really, since you can’t play around with gravity too much. One of the maps looked more like the original (including a few spots where you could look at your own back due to the weird portalling 
), but it played terribly. Another one was a bit better, but the bots still didn’t like it too much. It did have some great touches, though, like portals that exited at bizarre angles.
The map paradox that I mentioned from SiN executed it very well. It was very playable and a whole lot of fun. I remember some really good times on that map.
The first Community Bonus Pack has been released for UT2004. All sorts of lovely levels. CTF-Skorbut is absolutely gorgeous, DM-Archipelago is stunningly beautiful, and DM-Reconstruct has a cool trick with floors that build themselves when you walk on them.