I tried doing Shattered Halls yesterday with my lvl 69 prot pal.
We kept wiping on Warbringer O'mrogg because I could not keep aggro on me.
I know he's supposed to have 2 aggro tables, but even after over a minute of fighting, when I should have solid threat lead on both tables, he goes after my party members (including the healer)
I can't figure out what I'm going wrong or if there is some problem with the boss itself.
That's part of the boss mechanics! I have memories of players having to kite the boss when he swaps target.
If you google him you can read more about how it works and how to defeat him!
Basically only tanking the first minute or so, after that it's just running around and hoping he doesn't go after clothies or crits too much.
Not really a pretty fight, and almost impossible with the group composition i had earlier (3 clothies that die in 2 hits)
Also: He runs too fast to actually kite him... really messy
That boss cannot be tanked normally by anyone. Even as a level 80 you will lose aggro at one point because of his mechanic. So just kill him fast or kite him.