It's supposed to be constructive criticism. Comedy Bang Bang is my favorite podcast on the planet, and I pee a little every Tuesday night because I know there's gonna be a new one. As Maria Bamford has said, "Comedy is subjective, it's an... an... an art form."
There are some of huge fans, we may be snarky or cunts or whatever, but the forum is not supposed to be a press release, it's a place to talk about the show.
That said, I don't think the critical comments are buried or ignored, they just don't add much fuel for discussion.