The Yeti cave elites are basicly the testing ground for group-content non-boss balancing. And I think they are spot-on.
They are challenging, but not frustrating. Whenever you die to these elites, you always know the reason why.
So, yes, pretty much. These will be my future baseline for designing D4 trash packs. Now that levels are pretty much static from this point on, I have the freedom to precisely adjust the difficulty setscrew.