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One strategy I did (Stolen from wowhead) was that, whenever there were some adds attacking Razorgore, I right clicked the orb while controlling Razorgore (You can target the orb from virtually across the room)

This both automatically refreshes the duration of the mind control and it seems to make the adds attacking Razoregore switch to you instead.

Just make sure you're not under the exhaustion debuff when you right click. (It prevents you from rapidly using the orb, basically.)

This guy still requires some strategy to beat. After reading a number of different tactics, this is what worked for me. Doesn't matter the class. I did this as a Paladin, but did not use any class-specific abilities.

First things first - take off all your gear except for your weapon. The mobs can't kill a naked level 100-110, but they can wreck your gear, and you'll probably die a few times getting the hang of this. You'll want to kill the eggs Razorgore's standing near in the back after first taking control - it seems it's harder to drop aggro off of him back there. Then, when the mobs are increasing, walk him to the back corner where "you" are until he clips through the wall. Mobs that are spawned will immediately run to "you" instead of him. Most of them. You can kill the eggs back here in the meantime. Wait for a while and then walk Razorgore around to kill the remaining eggs. You can click on the orb (it can be hard to see with all the mobs) as Razorgore to drop - or nearly drop - all aggro from him, then, as "you" again, click the orb to take back control.

None of Razorgore's abilities do much of anything, and have a long cast time, so don't waste his precious health using them. Be careful when killing the mobs surrounding "you" if you're having trouble seeing the orb - at your level, so much as breathing on the dragon will kill him, which will in turn wipe you while the eggs are up.

Solo Tips for Paladins, This boss is easy to kill by simply buffing with Righteous Fury and keeping the 30 second HoT Eternal flame on yourself. Simply gather 1 (it does not need to be 3) Holy Power, cast thespell on yourself and keep controlling Razorgore, the HoT however low will keep agro off Razorgore, just make sure to stop controlling him every 30 or so seconds to apply it, This also works for Any other class with along hot.