[jlack]

I think it depends on the niche of the particular video. I've found channels like woodworking/machining have insightful comments from professionals in that field which may have alternate solutions or point out why something is done a certain way.

[showerst]

Seconding this -- the comments on machining and electronics videos tend to be great, comments on gaming videos are usually just jokes. This makes intuitive sense to me; different viewer bases who want to see different things.