Not saying there are not moments were the brutality isn't appropriate or fits the story being told. I agree, that moment works well. Him burning Obi-Wan makes sense.Though the way he Force-snaps that teenage kid's neck on Jabiim in an attempt to draw Obi-Wan out into the open is just plain effective. Disney Star Wars might sometimes go overboard making Vader look like Space Hitler in a black helmet, but moments like that scene on Jabiim work.
But, then there's the comics of him just slaughtering everyone, matter what. I see calls for an R rated Vader film of him just being a Jason Vorhees-esque figure of murder death kill because it's "cool ". Rogue One hallway scene is so tonally out of place but gets applause because "cool."
I don't know. I'm sure I'm sounding like a wet blanket over violence in my Star Wars franchise but it goes too far in my opinion for the sake of being cool and violent. It's adolescent to me.