Visually great, plot wise a mess.

Rating: 7/10 (8 June 2013)

For starters, this movie makes no sense. In the words of Mr.Spock, "It is illogical". While watching it in the movie theater, I did like the scenery, FX, CGI, set design was impressive; However, the plot did seem like a rip-off of many sci-fi movies such as Blade Runner, Moon, various Twilight Zone episodes, 2001, Stargate, Planet of the Apes, Total Recall, The Matrix, etc.
>>> Warning, spoilers below <<<
2 NASA and 1 Russian astronauts are sent on a space ship to some planet. On the way there, NASA detects an alien ship. The astronauts are told to investigate. As they do so, Jack Harper launches an escape module with the female Russian astronaut(Julia), who just happens to be his wife. The NASA ship is pulled inside the alien ship (referred to as TET). Then TET destroys the Moon, makes thousands of clones of Jack Harper which it uses to invade planet Earth. Humans respond with nuclear weapons, seemingly defeating the aliens... or, as JH is told and we are led to believe.
Now here is where it gets rather silly: Then, 60 years later, clones of JH and Victoria believe they are just 2 people remaining on Earth. The clones have no memories of the past as they are led to believe their memories have been wiped.
All the humans have somehow been re-settled on Triton. How could humans after a nuclear war built space ships, and ifcourse housing on Triton is unexplained. But alas, humans need water, thus we have these giant water-sucking things stationed on Earth. Aha! Why didn't anyone think to just clean up Earth instead of spending resources to build ships and transport water to Triton?
But wait, if the aliens were defeated (eventhough TET is still there) wouldn't more of them come later to avenge their dead?
1st: why keep all the JHs and Viccys a secret from each other? Seems pointless and counter-productive. Had they been told they are clones, why would their mission been compromised? Apparently, each team was told not to go beyond their own zone because of radiation.
2nd: 60 years after being ejected from the ship, Julia crash lands on Earth because the rebels have finally figured out how a beacon works. She is rescued by JH, and is told (as JH believes) of what has occurred. However, certainly Julia realizes that neither her husband nor Viccy have aged at all. Thus, she laughs at their story, and seeks the truth by recovering the ship's voice recorder. As some have mentioned, why does the recording of the cockpit still continue after the escape module was launched?
3rd: Where did TET come from, what is its purpose, why is there only one, etc.? Isn't there plenty of water on other planets, comets, Moons of Saturn, etc. Why start a war with nuclear armed humans? Why didn't TET show up on Earth 100million years ago when there were no humans and dinosaurs walked around? Even 200 years ago humans would not have been able to fight off an alien invasion.
Also, since water has been contaminated why would humans need it at all?
4th: Why was a giant robot, which was hiding in the basement, needed to kill just 2 people? Why wasn't dynamite placed at the legs of the house instead? Or air and heat shut off, or gas pumped in? Or food and water delivery stopped?
5th: Can 2 people really tolerate each other for 5 years? As Oscar & Felix prove, they cant. Now, 5 months I could understand; and in fact I was expecting them to be on a ship in reality. Also, Why didn't Viccy have kids, was she or he sterile?
The script wasn't thought over very well. Now, yes, other sci-fi classics do have plot problems as well; check the FAQ and boards for 2001, how could an astronaut leave his ship without his helmet? If HAL wanted to kill all onboard the Odyssey, it could have just opened all the doors, or shut off the food and water, or reduce temp to -200f?
Why do apes on another planet speak English, but humans are as dumb as monkeys?
How could Skynet have built a time machine, but no metal could get through, and be so stupid as to send a cyborg which obviously does not blend in with the populace?
Why did the Death Star have a huge hole big enough for a plane to fly into?
How could an alien ship leave behind a strange looking creature like ET on Earth?