I'd like a bit (lot) more variety in gear. A lot of people seem to scream about how it would turn everyone into rabid savages that refuse to play with each other. That certainly could happen if implemented poorly -- essentially in a fashion specifically favoring this outcome. Something like deciding Odin/Behemoth should drop the best weapon in the game, but only have a 5% drop rate. I don't imagine gear acquisition would be changed and since all I ever see are people wearing bits and pieces of the best, say 4 sets in the game, I don't think people would have any particular trouble gathering gear if it were more diverse than it is now.

Mostly what would happen is the stats on the gear you have would be more varied. Some players would go for specific pieces of gear and collect their entire BiS set, while others would piece together something slightly less effective, but still worthwhile. Essentially the same as now, but you could potentially feel better about adding "Jump damage +5%" than "Skillspeed + 44" (not that I'm suggesting removing the current secondary stats).