Dtroop cooldown reduction

Nope.

The attack can be dodged, and it doesn't decrease in someone with a buff.

Oh thanks. He's suprising good in a Sith team

Paired with nihilus they can really shut down enemies by taking away their special abilities. And they both essentially have insta-kills. Keep them alive with a good tank or tanks and it's just a matter of picking them off one by one.