I think the best sci-fi is The Matrix and Independence Day.
Mars attacks is 100x better than independence day
Agreed, and I'd say Mars Attacks is probably better than a lot of the other movies mentioned in the thread so far, though it's kind of an unfair comparison; it's a comedy after all, not a sci-fi movie.
I have to admit I haven't seen Transcendence yet, but both the plot summary, and the votes and reviews on imdb aren't that great. Is the movie really worth the 2 hours?
I think its worth it. If you like science fiction this is for you. The movie presented what would happen if singularity is achieve. So many advance ideas that I'm sure will be possible in the near future. You can download it on piratebay.se or in kickass.to, dvdrip is already available.