I'm definitely going with the taken.
They have so many obnoxious units that just force you behind cover to avoid taking too much damage or be thrown around.
It's not even like they are hard to kill, they just have so many annoying extra abilities.
Particularly hate the hobgoblins and acolytes.
[spoiler]the last one is a joke[/spoiler]
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Architects But as for enemies you can fight, Taken phalanx by far- blasting you into walls and off maps. I mean, Bungie literally took that ability to blast you off maps, and put it on walls in the game...