In my 3.3 tank weapons list, organised in rank order, I have [item]Bryntroll, the Bone Arbiter[/item] listed as equal fourth. Note that list was written before we knew about no parry-haste in ICC, and therefore I gave expertise a higher weighting since it reduced damage and generated threat.
Kuren has investigated the question, how does its drain life (self-heal) generate threat?
That’s just geek cool.
Update: had typo in title, it’s not toll but troll.