IF this thread is about Shadow Priest vs Feral druids in term of dps? and not Feral druid vs Rogue ? i would say they are about the same. They would do roughly 1000 - 1200 sustained dps if they wear gear in dps and dps the whole encounter. The difference is, one is range and one is melee and also different utility they bring to the raid. Shadow priest as a mana and hp battery while ferals for their rebirth , innervate and LoTP. I basically favor feral over some encounter. I can't imagine trying new bosses with only 1 rebirth from your restore druid maybe. Having 2 feral will make the encounter more forgiving. And when you want to compare DPS, try compare a fair encounter like HWL Nanjentus , Teron , Gurtogg where everyone gear should be tip top if not perfect.

Yes. Rogues will always top the dps meter with the average of 1600-1800dps if the encounter weren't too melee unfriendly. Bring 3 to ensure you meet the enrage timer. Lol

Rogues are not as poor as Hunters

During your raid, feral dps is always at bottom even in full dps gear and they can dps 100% of the time. Hmm, where were your raiding exactly and what encounter are you talking about? And your shadow priest, losing to mages and hunter ... Mainly ... something doesn't seems right.