A few things I'm looking for:
-Pokemon spawning in the wild (There was one server where they didn't and only spawned near spawn, which I found strange)
-a command that teleports you to a random location (This was something I found really useful, and none of the servers I've tried so far have it)
-helpful, friendly community
-a way to claim homes (most I've seen do have this, but felt I should put it in anyways)