The first two times I beat the SFK boss, it went off without a hitch... the last two times through though, he caused me all sorts of headaches. If he mind-controlled my paladin, for example, especially early in the fight, bad things tended to happen.

One thing I have noticed is all the item drops are overleveled now. I guess blizz retuned all these instances and in many cases made them lower level.. they also upgraded alot of the loot.. but it seems they forgot to lower the quest levels and the item levels.

So like the BFD quests are level 28 but easily completable at level 24.. and alot of the drops are level 25/26/etc min level.