If you are cornered and your only chance for survival is fighting, alright, but it's completely idiotic to see some level 5 Nord raise his fists and run into a cloud of thunder spawned by vampire or a [censored] dragon. There is such a thing called a survival instinct
The AI is Skyrim is just horrendous, and there is no sugarcoating this, it's easily one of the worst aspects of the game, and I feel like all this wouldn't be such a big deal if it wasn't for this.
I could never for the life of me understand why armorless, weaponless citizens would rush up to a Dragon spewing fire everywhere and try to punch it to death, or why they would think bumrushing a Mage releasing giant exploding balls of electricity is a good idea. Hell, even the beggars get in on the action, with their cute little daggers and what not. NPCs should be flagged as Citizen or Soldier; NPCs flagged as Citizens would FLEE from a battle instead of rushing to it, while NPCs marked as Soliders (Guards, Followers, and characters flagged as essential who can't die anyways) would be the only ones dashing pell-mell into the fight with that Revered Dragon or random group of Vampires.

XD The scary thing is there are plenty of people in the world with Skyrim-AI-level intelligence who actually WOULD think that's a good idea.