My RL best friend, who has NEVER played a pally before, his highest character is level 62 warrior, who is TERRIBLE at warrior, decided that he wanted to try doing Hyjal waves like he's watched me do so many times in the past. So, naturally, I let him! I taught him how it works for the first couple waves, and yeah, he had some problems at first, like accidently bubbling cause its next to my consecrate (Yes, I live life on the edge), and let a couple people die before he clicked it off, but after that he really got going, and I was surprised.
So, after healing on Rage Winterloot, he tanked the Anetheron trash with surprising ease. I took over on Infernal tanking for Aneth, since thats kind of touchy/important. I figured he'd screw up tanking Kaz'rogal trash, but it was wave 8 of 8 before I knew it.
Anyway, long story short, he was able to tank not only all 4 bosses worth of trash, but also the Doomguards on Azgalor, with minimal training and supervision.
I feel like a trained monkey right now....

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If these numbers are low, I'm LOLRET.