Honestly, the length of that fight is its own form of difficulty.
Nah it really isn't imho. We're talking about a teleportet Level 1 Char who has not even finished the Escape Quest but teleportet to Shearpoint right away just to make the point that even with the worst possible gear and no potions this fight is doable. This is the worst possible setup for any player encountering Krosis. Yet he spends roughly 10 minutes doding attacks and the rest the fight is simply that long because you don't deal much damage with an iron axe and no perks or one-handed skill on master.

And that's not just true for Krosis, it's at least true for all of the Dragon Priests I fought so far, all Dragons, Giants and Mammoths. All doable with a Level 1 Char on master without cheats or exploits. And that's no challenging gamedesign and it is - in fact - too easy. It might be fine, if it required some sort of genius strategy or insane skills. But believe me, I had neither and I could do it...
