Let's be clear -- it's the annihilation of most of a city that was often deserted except for the random quester. There are survivors, of course.
Not in canon.
Also, keep in mind that most of us far outgear this scenario. If done at the appropriate ilvl (354 is it?) this scenario would have taken longer and been more challenging.
I'm not really concerned with the difficulty of the encounter. Though, to be fair, I ran this on a Frost DK with two rogues, and I died to one of the bosses and we almost wiped. This with a group that was pulling 25K, 22K and 12 K dps. Done at the appropriate level, it most certainly should prove challenging esp if you have no heals. You can get away with no tank.
But that's not what I'm talking about. In the world of Azeroth itself this was a big event and should have been a big event. It's fine to tell people to go google this or that but the point is, people should not HAVE to. It should be information given in-game. Heck, you could have received a summons from Varian if you're Alliance, and ordered to sail to Theramore. Ok, you don't get there in time for the bomb, but at least you have some idea of why you are going there and what happened (Rhonin, etc).
Is this too much to ask for?