I mean, I often don't feel the right picture gets picked as the BEST one, but I still do greatly enjoy quite a few nominations. From this past decade alone:
2010 - Toy Story 3, Inception, Social Network, Black Swan, True Grit, The Fighter
Haven't seen any of the 2011-2013 ones though a few are on my watch list
2014 - Birdman (disappointed that Gone Girl and Nightcrawler weren't nominated)
2016 - Fences
2017 - Get Out, Dunkirk, Three Billboards Outside Ebbing Missouri
2018 - Black Panther, Bohemian Rhapsody
2019 - Once Upon a Time in Hollywood, Joker
Also in terms of winners before that, I love Rocky, Silence of the Lambs, Forrest Gump, Gladiator, Return of the King, The Departed, and No Country for Old Men.
Probably my personally least favorite winner is American Beauty. I admit to liking it on my first viewing nearly 20 years ago, but my second viewing was not so great. The subtlety is non-existent, I hate the word "pretentious" but it actually fits here, and the concluding message hilariously doesn't fit with the rest of the movie ("oh man, life was beautiful all along! Hard to buy into that considering we just spent the whole movie watching people be mostly miserable and/or ruining their lives, but trust us on this!" The cast is mostly great though, I'll give it that.