As far as hosting all the Valve maps go, I don't think that's necessary... Hydro was alright, but it tends to just end up in a back-n-forth round lasting for hours (tc is a good concept, though). Well (the map, both versions) I feel is just poorly executed -- it might because I never spent the time to get the hang of it, but it just never felt worth sticking around (nothing compared to the original ctf).
Badlands I feel should have another chance, though. It seems that by design it's the most balanced for all of the classes, and the ten minute times really help keep things moving back and forth (if not 10 min... maybe 12 would do). It never seemed to be that empty... It's just simple fact that 2fort, Dustbowl, and Warpath tend to fill up first, and tend to slow down later at night, but compare the player avg per hour to either Warpath #2, 2fort Gamerail, or Dustbowl #2 and I'm sure it wouldn't be any worse.
Haven't tried out Goldrush though, but looking forward to it...