Celestial Nighthawk is a waste of an exotic slot in most situations. It deals quite a bit of damage, but it's also an exotic. The Sunbreaker's DPS isn't even tested yet. You can't really compare it to Celestial Nighthawk yet. In any case, do you honestly think the Mr. Fruit is complaining about Titans being weak in PvE? Titans are amazing in PvE. Bubbles for days. Weapons of Light and Blessing of Light are both fantastic.