All 3 of my characters did Torghast with 125-135 iLvL immediately upon hitting 60, and the results were mostly the same (blood DK, retribution paladin, balance druid). The only character that died was my paladin twice and that's solely because I was being super reckless at certain points.
It was slow going though, especially layer three on both my paladin and my druid (I'm most unfamiliar with these characters), but part of that was due to a bit of RNG with the powers that I happened to get on the hardest layer (go figure, lol). Basically on my balance druid I was all but forced into doing the root build and my damage sources were pretty sparse to say the least. Luckily, roots cheeses everything because it doesn't really put you in combat, but it does take you forever to kill things. My greatest fear was that it wouldn't work on the final boss, and it actually didn't (obeys PvP duration). Still managed to get a kill, albeit barely.
I can't really tell what the true difficulty will be, but for those claiming that it's a pushover, there absolutely is the potential that you just got lucky on the few runs you did. Rogue-likes are literally designed to have RNG to where you can just easily breeze through shit if you hit the right upgrades. The inverse is also true, and poor upgrades can make the difficulty way harder (but with good play, and thinking about what's given to you, you can usually get by).
People need to keep in mind the design intent of Torghast in general. The only thing you're wasting by going slow is your time, but you can also waste your time by rushing through and simply not having the upgrades to clear the final levels either. Finally it's the first week and the later difficulties and the hardest sections of Torghast aren't in the game yet. I believe there's a more challenging mode with 18 floors in it, where things like the death counter might come into play more.
For anybody having problems with Torghast, I'd literally just full clear floors before moving on and think about single target damage and what actually makes you better against bosses.