If you had to choose: The ONE thing you would change about EQ

[Skope]

instanced dungeons -- something WoW did right!

Bazaar! -- many may claim that it killed EC tunnels and player interaction, but who interacts with players who are selling items? Half the time they're trying to screw you on the price of an item such that it only lessens the sense of community. Bazaar allowed you to focus on the stuff that actually mattered -- groups and guilds, encounters and zone/dungeon hopping -- without being bothered to sit in a zone for hours on end trying to find an item.