If you're playing DiD, especially on Master, then none of the combat skills are overpowered.
On my Assassin, with invisibility and shadow warrior, if I do not take enemies out from stealth I'm in trouble. Re-casting invisibility or using shadow warrior in melee range if my initial backstab did not 1 shot is very risky because I cannot risk taking a hit or two. (lvl 38, 300AR 400HP) I also did not use any of the crafting skills besides arcane blacksmith. The trade off was I perk'd Illusion. Anyways, I'm sure people who talk about how combat skills are overpowered are still dying in the game. And most, like the OP, use his/her combat skills and run into a situation where one particular enemy, boss lvl or not, was easy for them. With a Thief build, 1v1, you will have trouble with Ancient/Elder dragons for example, unless using a summoning staff.
More OT, yes Draugr of all levels are very easy to sneak up on and get away to re-enter stealth. It's when they find you, that's when you're in trouble. If you fired an arrow and it didn't kill a Dragr Deathlord out right, and he did search hard for you, that wouldn't be any fun as you would have to run far away or wait forever. Imagine it like this, if they search for you for 20 sec real time, that's like 20min game time. Sounds reasonable enough to me.
