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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Most annoying: Taken -no more needs to be said Second most annoying: Scorn -some of their guns just feel like straight up bullshit Least annoying: Hive Most fun to kill: Cabal lol Hunters at least have to reload.