as stated above, some of you guys need to learn what the genre sci-fi entails.
alien/aliens is not sci-fi
star wars is not sci-fi
gattica is, as well as frankenstein.
sci-fi is not just a space movie, or something futuristic. it is a combination of content and thematic elements. alien is a monster movie. the exact same movie could have been made about a gorilla in 1880. aliens is a combat/action movie. alien: resurrection, however, is a sci-fi film, because it deals with technology from a thematic standpoint.
look at the first terminator film. it includes robots, cool guns, and time travel, but it really isn't about these things. it is a run/action picture--sarah running from the monster. but then we get to t2, and things change. all of a sudden, we start seeing time travel, not as a plot device, but rather as a human conundrum. we have to deal with the real issues of time travel. we have to consider the moral implications of the read/write switch on the csm101's cpu. the last line of the film makes a compelling case...
"if a machine can learn the value of human life, maybe we can, too."
this is what sci-fi is.
if you want to get a better understanding of what sci-fi entails, quit watching movies for a while, and go read some of asimov's short stories. i think you'll begin to understand the difference.
(and yes, the matrix is most certainly sci-fi.)