You didn't really give us enough information to answer this. And if you had, it'd still be a mediocre question.
Well I've been running with 21/50 since yesturday, I did a 10 Man Naxx run with it and I was pulling steadily 2.5k DPS on most pulls, haven't even gotten to Patchwerk yet though. I don't have my 4 Piece yet, 6 Non epic's left on my char tho, and I've got a Strength Gem in every slot. Might my rotation be off or is it just not enough proper Gear to pull out amazing dps numbers?