I've been happily levelling my alt, a shadow priest, since getting my rogue to 80 and parking her a few months ago. I'm now at level 64 and last night I PUGed Ramparts with Recount up. I was truly and utterly awful, with 8% of the total damage and about half the total dps of the tank and other two who were hitting around 500. The thing is, I have no idea why I was so bad. I was in a group with a 66 DK (tank), 60 DK (dps), 59 mage (dps) and a 63 priest (heals). I'm particularly ashamed that the 59 mage put out so much more damage than me.
I've run Ramps twice before, once as dps at level 59, where I didn't have Recount up and once as a healer, with no wipes, so I knew the instance and the bosses. Although I'm an infrequent poster on these forums, I read them and try and learn from them, as well as EJ and other places. So I don't think I'm a drooling moron.
My rotation is VT, SW:P, VE, MB, MF, MF then MF keeping MB and VT up where required. I don't know if this is anything to do with it, but I barely got to MB on the trash last night before things went down as the tank was quite OP, although surely this would also have impacted on the others' dps. I managed several rotations on the bosses though with no appreciable difference.
My armory is at: - http://eu.wowarmory.com/character-sheet.xml?r=Draenor&n=Majolica
And yes, although stood back, I was in range! (I checked).
Sorry about the 'pls help' post, but thinking I knew what I was doing, it's come as a horrible shock to find I don't. My rogue is not nearly as dreadful - putting out about 1800dps as a fresh 80.