Though I marked it as 'contains spoilers' here is a relatively spoiler free review for people that wanted to watch the show when it finished airing but are now hesitant after seeing the reactions to episode 16. I used the word 'relatively' because even though I'm not saying what happened, the words I use make it easy to figure out the ending.

This show is beautiful, it really is. The way they portrayed sportsmanship, relationships and friendships were everything. I found myself crying to scenes that weren't necessarily sad because the actors did a really good job at making me feel a million different emotions. Let's not forget the fact that there are so many hilarious scenes and great character development.
If you want your heart to not feel like a hollow shell, it's best you stop watching by episode 14. It's really not about a sad or happy ending but rather a really rushed one. They could've cut out some scenes and explained a bit more on why things turned out the way they did but unfortunately they didn't. It definitely is worth a watch but if an ending makes or breaks a show for you, it's best to pretend the show ends in episode 14. I'm sure you saw the word realistic being thrown around whenever anyone mentioned the ending and I love realistic shows...just not when it's done like this.