Interstellar
Wow.
Interstellar is one of the only long movies where the length is worth every second. I'm not particularly fond of long movies because of my poor attention span but every second was important for the end and nothing was wasted. The cinematography is also stunning. I still have a few unanswered questions but that's because of things being ambiguous rather than the presence of plot holes. To conclude, this is now one of my favorite sci-fi movies.