It does so well, because it doesn't try to do everything.
It's focused on a single task; and that's mowing down anything that it can find. I don't like having logic for 54209483 different things, when 1 set of logic works for everything, 95% of the time.
The issue with most of the current CCs that seem sluggish, or 'dumb', is due to them trying to do too much, instead of just playing the class, and playing it well.
Also; you can thank regecksqt for the feral DPS rotation. (I basically ripped it, with minor modifications)