Yeah I used to get this a lot at the beginning, you gotta push through, if you are getting one shot killed then you are probably going the wrong way, if it seems like you have a chance if you play strategically then just carry on.
Yea, that's what I've been doing. The game throws so many powerful looking enemies at you at once sometimes though. I just beat a boss and around the corner I'm hit with 1 hit that takes down 80% of my health (I just replenished my health right before too!). Then I move along only to see these other group of guys and I'm like wtf and then right after that there's more! I love it lol.
The game really encourages you to explore and not "just go forward and kill stuff". If you do that, you'll just keep dying but then the next time you get to that area, you examine it a little more and something clicks and you're like "OMG SO THATS WHAT IM SUPPOSED TO DO". But then the next encounter takes you through all of that again. Really makes you second guess yourself and I'm loving that about it. I'm about 3 - 5 hours in.