Diablo III: Reaper of Souls

I blame diminishing returns on Resistances. Even though you have like 500 higher than mine it probably only gives an extra 5-15%, but probably adds a crapton to your Toughness score.

Plus half of the time it feels like Resistances don't even matter when you hit an elite pack, they tear straight through it. I know it does, but it doesn't feel like it sometimes.