Yep, this patch has been very good for Defiler DPS. The HOs are significantly stronger and DoT damage is much better now that stacking is easier. For example, at level 26, Divine Judgment's damage has more than doubled. I can now stack Tierbold's, Fulginous Sphere, and Contamination for over 100 damage per tick. For me, at least, the DoTs feel substantial for the first time.
That said, I'm concerned about the effectiveness of our buffs, post-patch.