This may seem somewhat silly to the rest of you, or those of you with more experience, but I sure enjoyed it.
I was messing around on my paladin, questing a bit in SP when a guildmate asks if I can tank what they haven't finished in reg. HoS (my paladin is 78), because the 80 DK they had tanking just bailed, and they'd wiped on this boss four times. Dunno the name, its the big rock guy that turns you to stone.
I've never run HoS before, this was my first time ever seeing the inside of that instance. I charge in, and while the rogue is in another window looking up strategies to defeat him, we stomp a mudhole in him and he dies. I was pretty happy, especially since the DK that was tanking before had left my guild a few months ago..sweet sweet justice!