The class is designed as a support. Fine. That doesn't mean it's incessantly annoying. Rogue is getting shit for stepping out of what people deem his class mechanic to be (and for being a dick).

I would rather much prefer an enemy I couldn't kill who was interrupting my leveling, or rather one of my leveling areas, with occasional summon/plague/trepidations than a healer constantly gating/healing/waking up/sancing the person I'm about to kill.