Personally I really enjoyed The Red Turtle and would have liked it to win, but Zootopia was good too. Much better than I was expecting it to be, to be honest.
This is a legit good year for nominations. Zootopia, Monoa, Red Turtle, Kubo, all had good merits to win, and appealed greatly to different audiences. You want a bad year to bitch about? Bitch about this one:
Big Hero 6 Don Hall, Chris Williams and Roy Conli
The Boxtrolls Anthony Stacchi, Graham Annable and Travis Knight
How to Train Your Dragon 2 Dean DeBlois and Bonnie Arnold
Song of the Sea Tomm Moore and Paul Young
The Tale of the Princess Kaguya Isao Takahata and Yoshiaki Nishimura
Holy shiiiiiiiiiiiiiiiiiiiit.