I do like this show but not THAT much. It has its moments but I personally can't find the show to be funny enough or as widely applicable to have a long standing run like most adult swim shows like ATHF, or Sea lab 2021. In any case, even for a non death metal fan I admit the music can be really catchy.
I have only seen a few episodes and there have been some really good ones admittedly. I personally loved that heroine snorting rock and roll clown, and that one episode where they adopted a kid and he ended up being like a wild boar, freak of nature thing.
I couldn't stop laughing when they brought him to a vet to get nudered.