Doesn't help alot if he re-emerges and instantly trashes you in the face before you can get things rolling.
I'm not saying it happens often, but it does happen, and I'm 99% sure that I've seen death logs of upwards of 325K hits from sha on him.
http://www.worldoflogs.com/reports/r.../?s=485&e=1605 look at the death log of Eddy here - 200K, 183K, and then a 432K hit (2x critical blocks and last one not? Seems to be 300K/275K/185K blocked damage if I read it right).
I mean, thats quite far from your "hits for ~275k"-statement. A bit earlier in the log, sha hits him for 325K, too.
If it's capable of hitting for upwards of 400K, it'll be capable of doing that for dread trash too.
Regardless of that, what about a guild that doesn't have a prot warrior decked out in heroic gear? A DK ceartainly will get blown to pieces, there's not much they can do. Same goes for a bear, and especially a brewmaster. Paladins might be able to chain enough cds, but I don't know enough about them to be sure.
It's madness all over again really - one class can pretty reliably survive due to class mechanics (this time it's warriors instead of DK's) and if you don't have one, you're screwed. It's just bad design, really. They could have made trash a mechanic like WOTE, where you'd be given a few seconds warning to GTFO of the way to survive, have sha hit in a random pattern or something and make sure that there'd be severe punishment for just running away.