I don't remember all the movies I saw/came out this year, but of the ones I actually saw, my favourite was probably honest-to-God Mamma Mia 2: Here We Go Again. Cinematic brilliance.
A Quiet Place was good too. And controversially, I don't think Jurassic World Fallen Kingdom was as bad as everyone says. Not good: but definitely the second best Jurassic film, and MILES better than the first Jurassic World
I didn't see Avengers Infinity War but it just kind of annoys me, as with all the MCU. Was the Greatest Showman this year? I hated that with a fiery passion, so I'll choose that as my worst.