Just completed it as a prot paladin...907ilvl. heroic tier 2PC....legs and neck as legendaries....memento and royal dagger as trinkets (i used royal dagger because of the extra life for Kruuls annihilates).
I've put in over 100 attempts...most of the wipes were because of smash knockback...i have not experienced any bugs in 99% of attempts.
Biggest tips i can give is to maximize dps on Kruul and save as many Orbs as possible for him...HoJ plus the orbs disorient is clutch on Kruul when he's about to cast Twisted reflection or after a stomp or to delay annihilates...running clockwise of counter-clockwise when fighting kruul is the best....never backtrack because a smash will catch you...save Steed for running to an orb for (ohhshit) moments. If you constantly move then the stomp will play little effect because you'll be 80% out of it after he casts it...
For annihilate i used the following CDs...1st i let it hit its no prob...2nd i used AD (because i have it on 1minCD) ...3rd i used Guardian....4th i used AD again (if its not off CD then u can use BoP)....if you are about to get a 5th annihilate you can delay with HoJ and Orbs for about 10 sec... he should die by that point.
Its definitely the hardest encounter i've faced...good luck to all