"Berserk" belongs to dark fantasy and action genres, with lots of fighting, blood and violence. It is somewhere between shounen and seinen series. I really liked the setting, which changes much from realistic medieval to full fantasy, including a lot of themes. As setting, character change and grow (or descend) during the anime. It is no wonder this is one of most appreciated mange for lots of people.
Also, the "Golden Age" arc is not the beginning of "Berserk" manga. Mange starts with current Guts (I will avoid spoilers) and his fight against Apostles, and then he has a long flashback to his past - which is actually the "Golden Age" arc. Original anime follows this principle so it is more successful in hooking new fans. These movies concentrate solely on the "Golden Age" which, in my opinion, is poorer choice. Because, if they have any attention to continue the plot with new movies (and I read rumors that they do plan so), they will be forced to skip this part.
One of the most notable aspects of this anime is the very extensive use of CGI animation. While I don't like it myself, some people do - but I think that most will agree it was done not so good here. It just doesn't look natural. It has some advantages, like that architecture is very detailed and realistic, but moving people are just bad and too generic.
The anime stays true to violent nature of "Berserk", which means that there is a lot (really, a lot) of blood, nudity, sex, violence. When I saw the animation, I though they will "adapt" the show to wider audience; but they didn't and I appreciate that.
I don't remember the music from the original anime, but here is very good.
The final verdict? Even though I liked this new adaptation of "Berserk", I would not really recommend it. For those unfamiliar to the series, I would direct them to the original anime "Kenpuu Denki Berserk", which captures the feeling and experience of manga much better - this version is inferior in this respect. The movies are not bad, but I would really recommend the only to those who haven't watched or read "Berserk" for long time and just want a quick reminder. To everybody else, go watch the original.