Well, I had a first try at Utgarde Keep yesterday evening. I cleaned the first room with vikings and the second with dragons. I had to stop playing after that, so I cannot comment about the rest.

With my characters being level 71 and the gorillas level 70, it was NOT easy at all. I systematically lost at least one pet on every pull of more than one mob, and I even wiped a couple of time.

I don't have the impression my DPS was lagging, mobs were going down quite fast. It was really a question of pets not lasting long enough. I am admittedly not the best of healers, but they really died very fast. Certainly a big difference compared to BC level 70 elite mobs.

I'll wait for my gorillas to get to level 71 before I try again.