First there is this.
This is one of the best music videos I've ever seen. It's not perfect, but it's close and was obviously a labor of love.
And this is a critique for the editing in Bohemian Rhapsody
I haven't seen the movie but the scene that is critiqued is a nightmare. Having worked with enough footage now that I can appreciate not having everything I need to create something good and have to try and cobble together something OK. What is a better sign of good editing? Making something good better, or making something horrible passable. I guess both, but usually the latter isn't appreciated.