Did some testing recently, and the controllers are rooted.
Once you aggro one of them you will read the following message:
Aneuk Controller raises its scepter and calls out "Finally, a chance to practice our tactics. Constructs, destroy their support tools!"
At this point the six Constructs of War will attack.
The controller hit my bard friend for 850 max, and casted snare and some other spells. They cannot be mezzed, but you can slow them.
Giada
65 Archon
Xev