I really don't like the idea of being able to remove comments you don't like.

Well yeah, that's why you can't. If you enable comments, then you agree to take constructive criticism. We do get a number of requests every week to remove negative critiques on images. We don't remove them, however, as long as they are not attacking or obvious trolling.

In my own view, the most precious and useful critique is the harshest. "I really don't like the lighting in this, she looks seasick" is useful. "D00d this sucks were r the b00beez" or "Burn in hell you pervert" is definitely not.

When surfing the galleries, however, you do need to remember that most people here are pure hobbyists who have never taken any type of art class and whose last criqitue was probably their mother saying, "Ooh that's great, baby, I'm putting that on the refrigerator!" For some delicate souls, telling them that turning on "cast shadows" would improve their work no end appears to be akin to telling them they are a worthless human being who should commit seppuku before inflicting any more of their crap on the world.

So when commenting I tend to look out for people saying in the notes "Critique welcomed" or "Suggestions for improvement wanted". I'd rather not waste my carefully-considered comments on someone who won't appreciate them, anyway.

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire