It might be my imagination, but I think they nerfed dragons. I had 2 regular green dragons attack me @ Western watchtower just outside of Whiterun. Usually, at my current level 57, it takes atleast 3-5 hits with my current sword. This time around I one hit both of them. Sword dmg is the same. Not sure could be all in my head.
So I take it that "nerf" means make the dragons weaker? I had the opposite impression yesterday while playing the first dragon we have to kill. This one killed five guards during the combat!!! It generally kills one, sometimes none, appart from the two burnt bodies that are already on the field... Oh that makes me remember: there was only one burnt body near the tower.
My character wasn't different of the others I played that dragon with before: same level (1) same weapons (ordinary, not improved bow), the guards had the same equipment than before and Irileth used a bit more her magic (shock spell). I liked it very much; it looked, and still looks, a lot more realistic.
I'm not using any fantasy mods adding this or that to dragons or to gameplay.