Just when I thought maybe I was leveling too much in relation to how far I've explored, the Necromages in Fort Kastav completely mopped the floor with me. Good thing I was only passing through on the way to Winterhold.
I came across some ruins in the western part of Skyrim where I ran into something like 5 Trolls. They came at me one at a time, except for one instance where I fought 2 at once. I destroyed them with ease. I remember how hard they were to kill when I first started playing.