Well, something is clearly wrong in the OP's case. I've found most of my dps issues belonged to the organic lifeform running the keyboard and mouse, so, in other words: me.
What I find most disturbing with Northrend is the serious lack of serious gear, the +spell stuff is killing me! I can't find +hit mail to save my life and when I do, I have to give up a ton of other bonuses on my existing gear. My dps and/or survivability takes a nosedive when I equip it. Now, I know +hit doesn't really come into play until 80, but still, shouldn't I have some +hit prior to 80? Thus far, I'm underwhelmed by the gear choices in LK and my current gear is Kara, S3 Arena, and rep gear... nothing to write home about!
I wish I could say I'd be surprised if I hit 80 and am still wearing anything I currently am, but at the way things are looking, Blizz is hardly sending Hunters some gear love in LK so I might very well be.