My definition of sci-fi would include the so-called "soft" sci-fi, which I feel definitely includes films like Serenity and Pitch Black.
I would not include Avatar, personally, because that movie really irritated me, but I understand why some would.
District 9, yes.
Children of Men, yes.
Present-day setting super-hero movies, I would not include as sci-fi, even Iron-man.
Minority Report, yes.
Animatrix, not exactly a movie, but it would be an honorable mention here. Pity the Matrix was 1999.
Innocence: Ghost in the Shell, I would substitute with the SAC movie, which I think is better, personally. If we're allowing double-dipping, I would have both.
A Scanner Darkly, yes.
Star Trek, hell yeah.
Sunshine, more Boyle love here.
I haven't seen Moon, so no comment.
The Prestige is sort of a sleeper sci-fi movie, but I think it counts.
Cloverfield is borderline horror, but in the end, I think it counts.
Oh, and don't forget the greatest science fiction movie of them all, An Inconvenient Truth.
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