I would rate him as a fair boss, rather than an easy boss like he was before. The problem with him before was that he died before he did anything interesting: now you have to actually perform the mechanics a little. I actually kind of prefer it now, as he uses Rotten Expulsion less which makes the fight more predictable and a little less chaotic, with less adds to boot.

For my money, Heartsbane Coven is the boss I find hardest in the dungeon on difficulties you don't over gear.