Complete lack of any AI for the monsters

[Walkiry]

For all this talk of a stupid AI that acts very little like a player, those are both awfully similiar.
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The players act nothing like the AI. "Hunt the squishie" is far more predominant in PvP than PvE. Players are much better at finding out who the most competent player in an enemy group is. Players don't break 2v1 engagements because a second foe just glances in the general direction of the "add", unlike AI enemies (try it yourself, when you see a 2v1 in PvP throw a weak heal, or a crappy ranged attack at the foe that is not being beaten on by your ally and see how likely it is he'll come after you when a 2v1 has a much greater chance of success, then try it in PvE and you'll see how you can pull adds off an ally by just looking at them if your ally hasn't been "building aggro"). Players can't be "pulled" by shooting at them and then running into a group of allies waiting to beat the snot out of them. Players seek these numerical advantages constantly and logically. Players realize they're in a losing fight and try to retreat waaaaay earlier than the AI. Players know how to use mobility to their advantage. Players lure enemies into traps, not just stand there pressing "attack". Players can interfere with "glass cannons" and healers without having to all switch targets and decide to stop a fight and start a different one (using crowd control skills on those pesky enemies while killing someone else) and can do this even before these enemies have used any ability that makes them climb an imaginary "hit list".

And if you want to see an even different player behaviour, battlegrounds have them thanks to the simple fact that there are rules to win encounters different than just merely beating each other until the resurrection timer is longer than the time you stay alive.