It is an interesting watch. The thing about this series is you can't just sit and watch, and hope it explains everything. You need to do some thinking, just a little tho not headache inducing I swear, but then again it depends on the person. We can draw our own conclusions about what the monsters are and why it came to be. It is more of a social commentary and less about monsters. There are moments where it is frustrating, anger inducing even. Characters makes some stupid choices but that's just how humans are.
Edit: Oh yeh don't watch it if you are a religious fanatic, you might feel called out just saying. For the non-fanatics, try it, you might like it.