I miss the AAs farming from EQ1 (Plane of Powers expansion if my memory is correct). It let you unlock abilities that you couldn't get anywhere else and let you have a unique build. It was a bit of a grind but I actually enjoyed socializing with some of my guild members while doing it.

Epic weapons for each classes (from EQ1 again, guess I loved that mmo a bit too much lol). They were so hard to get, not a lot of players on the server had them but once you did, it was a huge accomplishment. I think the main reason that lead me to quit so many recent mmos was that there's nothing that give you some sort of accomplishment. "Hard mode" dungeon doesn't count. Don't give me a easy mode to begin with, make me have to work with my guild a lot so we're all geared and then try end game dungeons.