I don't mind the people, but I get bogged down by the sheer amount of mindless time suck that many mmo's have to them. I've played quite a few, from the first Everquest, to Final Fantasy 11, to Wow, to Runes of Magic, to several other free to play games that didn't last long, to simulation survival MMO's like Haven and Hearth, or Wurm Online. All have pro's and cons', but what they have in common is that you need time to spend on them, and in the end you realize how little your time accomplishes.
In the end I still think about going back and trying something if: 1) it's free. I'm no longer