It can be amazing, but eventually they end up killing everything, and the next big step happens. They end up killing death and various angels and gods after a certain point. That sounds like an anime set up now that I think about it.

There are a lot of campy episodes when they ran out of things to kill. My favorite was the shape shifter who likes horror movies. It becomes like watching Capaldi in Doctor Who. Great actors, some awesome episodes, but the rest isn't up to the standards it should have.

If you actually know the cultures and stuff being talked about, it's obvious the creators just looked at a Wikipedia page briefly and then wrote a script. Sam hein is my prime example of that. There can be some really good episodes that don't quite get it, and then there are the bad ones.

Basically, it's a great show but they run out of things to kill and women think the main characters are cute. You can enjoy it, and recognize a bad episode pretty quickly.