To be honest I haven't had much trouble in Hellfire, though I only got there this Saturday. There was a hunter who kept harassing me, I did kill him once thankfully. Then later a warrior thought it would be smart to kill me, yeah I camped his ass.

Generally I was left alone, though flying mounts did make the hunter and warrior a pain to deal with.

edit1: XP wise I went there when I was 59. I kinda wish I would have waited till 60 because I like to be lvl 62 when I go to Zang, I'm 2/3 through 61 so pretty close.