I'm really surprised at the reaction to this (though it's the forums, so I guess I shouldn't be). This change is a nerf to Dawnbreaker.
Right now on live, when I hit you with DBOS, you get damaged by the initial hit and the initial DOT tick at the same time. That is going away -- the initial DOT tick will now have a two second delay. This will make getting hit with DBOS much more survivable than it currently is, because the buff to the initial hit adds less than half the damage that losing the initial DOT tick takes away.