A very rough adaptation of the stunningly brilliant 1951 movie . The first half is OK -- gives a decent vision of a post-singularity alien species that is essentially beyond material want through the use of nanotechnology.
But, I'm sorry. Keanu does a terrible job as Klatuu. And the government/military response is simply unbelievable. Why was Klatuu shot? How did Spaceguard find and track an object moving at 1/10 the speed of light? Why were the scientists called together hovering in helicopters around what they thought would be a devastating meteoric impact? Etc, etc...
Does have a good line though... "Your planet?"
http://www.imdb.com/title/tt0970416/