So I just made it to the Majelka (sp?) area with like 5 poison resist. Ouch.
Definitely think about the resists 
Hey OP, act 5 is intended to be done with gear from monolith as it starts at lvl 55 and you are givem keys from chests to do the dungeons,. Which should be easy lvl 55-60. Then go do monolith. That gear can carry you into act 9
wow we’re not playing the same game. im having trouble getting through the campaign because its so dreadfully boring and easy. i find myself just sprinting through the (albeit short) levels. currently in chapter 7.
my highest resistance is 31 and im not really paying attention to gear beyond looking for damage affixes.
as a sorc i had 0 problems, just died once at last boss and it was my own fault cause i checked do i can face tank this boss lol, how you have problems there if squishy sorc didnt ?
I can not agree with the OP. In my opinion LE is way to easy. You can faceroll thru the complete campaign an monoliths. I would EHG suggest to make the whole Game much harder. Because is just a joke compared with other Games.
Just a little feedback on this so you know…
I have levelled more than 20 Alts now in this game, so the campaign is extremely familiar to me. You are correct it is not hard. In fact the campaign is extremely easy (even too easy) and you really should not have any problem with it. A couple of bosses on the way (like Lagon) can be tricky for some builds or first time players, but other than that, the campaign should be a walk in the park. The game doesn’t really get challenging until you reach empowered monos and start pushing corruption (around player level 80).
As a footnote, I’ve read elsewhere that they have increased campaign difficulty on 1.0 release. Well I am currently levelling a new Warlock. He is lev 50 and currently at Lagon’s Isle, and I have felt no difference whatsoever in campaign difficulty compared to the other 20+ times I have been through it.