After having finished the entire manga I can say that it is genuinely the best thing I’ve read this year, and it will probably be one of my favorite reads of all time moving forward.
There are so many amazing characters (like I get way too excited when one of my top ten characters shows up for a single panel). Even though it may not seem like you spend a lot of time with characters on non-Karasuno teams, you almost always get a fleshed out backstory and begin to root for/love the side characters. I also love how there are no bad guys; I can not think of a single character or team that I dislike. Even when I knew which team I wanted to win a game, I felt heartbroken when the other team lost (the characters emotions feel so real and genuine). Of course, the Karasuno team members’ backstories and development are also amazing. Hinata’s growth (not just in character but in volleyball skills specifically) is fan-freakin-tastic and was not something I expected to be so dramatic. Also as a previous volleyball player, I love the inclusion of

Spoiler

sand volleyball

towards the end of the series as a new way for Hinata to grow. It was totally unexpected (at least for me), but makes me want a spinoff with more of this content. I can’t recommend this manga more. If you are on the fence about reading it, read it! If you are watching the anime, read it! Whether you like volleyball or not, read it!
This manga has my entire heart (which is totally broken after having finished the last volume and having nothing more to read).