I just got to Hel and am about to quit due to the bridgekeeper fight. Maybe it's not that big a deal on lower difficulties, but on the hardest difficulty (which hasn't been that big a deal up to this point for me) it is extremely common to take 1 hit and get stun locked from full health to dead due to frost. On top of that I put a lot of money and XP into Atreus and don't have him anymore, I'm forced to use a new upgraded weapon, and I can't grind because of the story.
This has got to be one of my most disappointing gaming experiences ever. I love this game so much, but it's way too frustrating to continue.