If something is extremely popular but you perceive something wrong about it of course that's a good reason to write about it.

At the same time many critics seem to just try to put artists down because that makes it seem the critic is above the artist because he can see the wrongness in the artist. Critics are wannabe artists.

It's different for other media, like an article about how a book or TV show or movie is historically inaccurate is sometimes fun.

I guess it's just the wrongheaded logic of criticism: The critic must prove they are doing their job. They are "critics", right? Therefore they must criticize. :-)