Questions about the Warrior classes

Hello, I have recently came back to playing and am looking at trying to find my main.
I have never really played the Warrior classes for any length of time but find myself looking at them this go around. I saw a warrior take on a world boss and kill it with no issues. How are they doing that with no healing. Sorry he was Solo when he did it. I love to solo in games. I play a Death Knight, but I am not sure how I am liking him right now. (Blood spec) I tried out frost, but it seemed to be a bit squishy. Of course I had no clue what I was doing either.
Anyhow. I kinda been reading up a little on Warriors and just wanted to know everyone’s opinions. I really don’t want to tank dungeons as I think that is a big responsibility and not sure I could do it. I have started playing around with Fury and it seems fun, but not much on healing thus far. So please if you would give me some insight on the good and bad of the Warrior classes.
Thank you.