I've seen about 18 of the list. I might have slept through one or two.
Missing from the list:
Europa Report - The best sci-fi movie you probably haven't heard of from the last 15 years. I'm surprised it didn't make the list, given some of the other small films that are represented.
Prometheus - Yes, I'm going there. I stand by it. Go with Alien: Covenant if you can't handle it.
Star Trek - Pick one. If you're going to throw a Star Wars movie on the list, you're nerdractually obligated to included a Trek film as well.
Honorable mention: Pandorum. Not amazing, but better than some of the lower tier stuff that made the list.
Doesn't belong on the list:
Colossal
Arrival
Looper - All three of these are movies that I liked, but I don't think rise to the level of "best". I really can't see watching any of them a second time.
Wall-E - This one pains me to call it out. I love this movie. It's my favorite Pixar movie of all time, and one of my favorite animated movies of all time. But that's the problem: it's animated. If you want to open this list up to animated movies instead of just live action, you have to consider many more amazing movies that are being left out, including anime. And the list is already being liberal with the definition of "sci-fi" with movies like Fury Road. If this stays on, there's a bunch more movies that need to join it.