Zootopia is the best movie I've seen in years, so that one for me. Fantastic Beasts and Finding Dory were also pretty good too. I haven't really seen a bad movie this year so I'm not gonna choose the worst one, I'll leave that to you guys =P
Edit: OH WAIT THERE'S THAT FUCKING ICE AGE MOVIE, that's definitely the worst I've seen last year, followed by the Angry Birds movie (I didn't want to see those btw, I just watched them because I had no choice really).