I created a character tailored to avoid this happening:
Level 31
440 HP (ring +40 health)
Scaled flawless AC @ 390 rating
Adept Difficulty
I read that low health, low ac causes the 1 hit kill. But having just started the comapnions quest, walked into a dungeon I (once again) get 1-shot by a silver hand.
Edit: Forgot to mention Light armour at 80 with all perks except the last one.
I thought an enemy out of every group was tougher - like the Draugr deathlord with his ebony sword at the dungeon start (no scaling like Oblivion?)
but this 1 shot was by just another enemy marked Silver Hand?.
Unlike past Elder Scrolls games, I actually want to like this, but since nobody releases games anymore that actually tell the player how combat works, I was hoping someone would be kind enough to here.