Story 8/10: Dealing much with the trauma of loss and abuse, this show takes an interesting dive into the mind of a victim of both. The story and approach to this topic through a piano prodigy who struggles with a sort of PTSD and depression concerning his deceased mother/teacher when trying to take back up playing is wonderful. What hurts the score here is that sometimes you'll forget that you're watching a show where the characters are supposed to be in middle school because of the colorful and extensive vocabulary they have (speaking for the dub); also, the main character, Kousei, is very, very, VERY dramatic.
Art 8/10: There is nothing wrong with the art, but this is a music-focused anime, so art wasn't my main concern here. How art still got an 8 is that the show briefly explores the concept of the beauty of the colors we see the world in, which is conveyed perfectly through the art.
Sound 10/10: I would have been disappointed if a show that uses music as a medium for its plot had terrible music, but thankfully this one delivered. Playing with classical music did wonders for every concert scene in this show, and there's not much to say about sound this good in a musical anime other than to go experience it for yourself.
Character 9/10: Each character is explored and developed to the point where all you want for them is to move on up out of middle school and be happy with their life. The only problem being what I mentioned above about their advanced vocabulary that makes you forget that they actually are supposed to be in middle school (and again, how dramatic Kousei is).
Enjoyment 9/10: From the music, to the story, to the characters, I loved the adventure that this show brought me on.
Overall 9/10: This was another show recommended to me on the premise that it was sad; I held myself together through pretty much the entire series, but in the last episode during Kaori's flashback, I just lost it. If it makes me cry, then you bet I enjoyed it.
TL:DR - While the story isn't exactly like "The Fault in Our Stars," the feelings it will leave you with afterwards are exactly the same