For some reason, I got Grim Batol more than any other dungeon in the Cataclysm beta. I would guess it was a popular place to go for ilevel 333 blues before setting foot in heroics, and chronologically, it's also the last normal dungeon you're likely to encounter.
There's an interesting quirk to the trash in Grim Batol. After a short clear (I would estimate the dungeon's first three "real" pulls, excepting the trogg mobs you'll swat in the antechamber), you'll have the opportunity to free red drakes who have been trapped. The drakes will thank you with a flight over most of the instance, and you can rain fire down on the heads of all the non-boss mobs you see.
A good group that coordinates the bombing will weaken or even eliminate a number of mobs. A bad group that puts in a half-assed effort will find itself with a number of full-strength mob packs standing between it and good loot.
Don't be bad.