The humor is really well done, especially in the end of the first episode. It's definitely geared to a mature audience, towards us that grew up with the games. 4 episodes feels like a total rip, but to me its feels like they were like "hey, let's test the waters and if it flops we haven't lost much money." I was hooked watching it last night, and I'm really excited for the next 8 episodes. They really went to town with the violence, which I don't mind as I just finished watching the newer Berserk series.
It's well worth a watch, but it'll leave you angry that it's only 4 episodes.