This is the most tragic love story imagined by the human mind. I first watched this show when I was young, and decided to rewatch it again recently, since I never officially finished it.
Yes, I gave every single category for this show a 10/10. I love this show, and I believe that any person who is a fan of romance anime should definitely take the time to watch this series. You can also learn a lot about actual love from this series; the way you should treat your significant other, the way you shouldn't, etc..
Honestly, I can't think of a proper way to review this show, other than saying I strongly recommend it to anyone. The art is very detailed, each character has something special about them in their own way, the plot for the show is outstanding. I wasn't born at the time that this show was made, so I don't know if it was ever a mainstream anime for the time, but I believe every anime fan should at least give this show a try.