Best DPS class in the game?

[Leraje]

Yea that's correct Dragoon lost all the priviliges of using any Archer Cross Class Skills. He gained Marauder as Cross Class Subclass.

20% from trait.

I think it's 30%. 10% more damage at level 20 and 20% more damage at lvl 40.
And let's not forget Barrage which cooldown got reduced by half from 180 secs to 90 secs.
River of Blood got revamped and now has a 50% chance to reset the cooldown of Bloodletter through critical hits of Windbite / Venomous Bite.
Everything else was already pointed out by Xianghua.