When listened to outside of the show the music is terrible, but I don't listen to it outside of the show so that's cool.
The first season was moderately funny at times; the second season removed everything that was metal about the show except for the basic premise. I don't want to seem like I'm whining because it's not metal; it's a show about metal, it should absolutely pander to metal fans while having enough jokes everyone can get to keep a decent audience. At the very least there should be a lot of in-jokes, but these just manifest as incredibly unsubtle place names; "Carpathian Forest High School," "Dimmu Burgers," "Fintroll's Market," and a couple others like that. Also, the voices for Pickles and Murderface are fucking unbearable.
And yet I have watched the first two seasons...so I guess the show must be alright.