This it'll be a short review for this great anime.
My first impression was, how this anime have a negative ranking?, the anime have a beautiful story and the characters design are so unique and pretty.
First is an anime with 8 episodes it is very difficult to have such an extensive history, I think that for 8 chapters this anime was handled very well by those 8 chapters to create a story and not only that, show some life lessons. For me the story was very good despite having episodes.
The art, i love the art of BRS, the characters design of HUKE i love it, i like so much the characters of Huke(Like some characters of steins:gate), Mato, Yomi, Black Rock Shooter, Dead Master, Yu, i like so much their designs, and the animation was very spectacular the colors, the movent, the effects, the worlds, i like so much and the CGI was very awesome, i think it's more nice the CGI of BRS than of Berkserk haha.
The sound, i like so much the ost it's Supercell and Hatsune Miku in OP and ED, and the music the OST, i liked so many songs of the instrumental of BRS.
Well i think Black Rock Shooter is undervalued, it's so good this anime of 8 episodes.