Monsters does way too much damage. even normal mobs oneshot you throughout the campaign if you arent running a shield. I was resist capped at one point in the game on my Bladedancer, but i could not feel any difference at all, compared to when i had around 25. I admit my armor was a bit low, but the game feels like it forces you to use a shield.
Other than that, i really enjoy the game so far.
You health and/or armor and/or dodge and/or recoup are the issue it sounds like. Source: I’ve gone through to endgame on at least 3 rogues without ever using a shield.
Resistances getting to 50-60 for nearing the end of campaign and getting at least 800-900HP (bare minimum) for the final couple of acts is a big must. Otherwise, should make it fine.