Diablo 3 is fundamentally broken

[FoxBat]

The issue I had with these fights is that they were not really matters of skill.

You've got several unrelated issues and I'm only replying to one. I'm simply stating that bullshit boss combos are not evidence of some nefarious plan to drive you to the AH (even if it has that effect), because some of them simply cannot be beaten with defensive gear. If that is what you are worried about, you roll glass cannon DPS for cheap and pray you can get back to them fast enough after your inevitable demise to whittle down their life some more. Or you play like their testers did and kill the butcher with 5K DPS and all the suffering that entails. If anything it is ugly design that is a product of lack of foresight, rather than incredible foresight that will drive RMAH profits which won't even exist for months yet.