The animation for this series is not so good. Others have said it, as well as the fact that it doesn't really matter. In the end it's the story that gets you hooked, with pretty well defined characters and interesting plot twists.
I especially liked how you can definitely find a character to identify with, even if it is not the main character. You start understanding why some things happened a few episodes before and why some of the things will happened next. Unfortunately the story ends with a HUGE twist, without any hope of continuation, which leaves you wanting.
I have watched a few anime series start to end these days, including Hellsing, Tsukihime, Elfen Lied, but I liked Berserk a lot more than any of them. Unfortunately I don't have the patience to read the comics, so I guess this is where the story ends for me. I wish they would do more episodes.
Again, I noticed this series described as horror. There is no horror within, except maybe the last episode, but it is moving something inside for sure. Watch it.