Leatherhead
Possibly a Idiot.
I just think that Controllers are missing something. Like... they need a little something extra to sum them up easily and differentiate them from the other roles.
That something would be called a class feature. Every other role has an implicit one, be it marking, bonus damage, or minor action healing. The closest thing controllers have to this is Orb of Imposition. The ideal class feature would be something that imposes a minor penalty or condition to a target that a controller hits, once per round.