My impression was that the Tet was a sort of automated harvester ship. The reason for the clones was likely, initially, to have an easily maintained indigenous force of troops to mop up what was left of mankind. Once they hit the suck up the water part of the invasion, then the clones had to have more elaborate programing to carry out the drone maintenance and it is probably easier to program a bunch of dudes with KILL ALL HUMANS than try and blank slate a fully grown human mind with all the technical stuff needed to maintain the plants and drones. The aliens seemed fairly low tech for an interstellar capable race, so my guess is it was a robot ship designed to go to planets full of water that they had scoped out with long range telescoped and rape them for the water resources (which are fairly rare compared to mineral ones once you are out in space). In some ways this is a refined version of the plot from Skyline, really, with the aliens having a giant photocopy machine to make biological grunts capable of carrying out tasks for them in the foreign environment.
It is also possible that it was a sleeper ship with aliens who may not have been compatible with earth, possibly due to the people nuking the shit out of it, and they needed human derps to run their machinery for them while they sponged up enough resources to move on to another planet, perhaps even Titan itself. The nature of the alien tech and efficiency centric demands of the "Sally" lead me to believe that it was more likely a robot ship, though. Also, if you are planning on colonizing a planet after an invasion, blowing up the moon is likely not the best way to keep the biosphere intact, which was the aliens opening move. Blowing up the moon is actually relatively easy, incidentally. All they would have had to do is accelerate a big hunk of metal to near light speed aimed at the moon to do the job, so that part of the plot I have little issue with.
The only real plot hole that bothered me was how the penis mobile (as my wife dubbed it) was not remote hackable by the Tet or at least had hard coded programing to prevent it from shooting at the drones. The Tet's interest in the survivor also bugged me a little, as there was no explanation for their interest in the survivor. I would have also liked to know some more about the nature of the invaders, but I can understand that being limited to keep a sense of mystery.
It is also possible that it was a sleeper ship with aliens who may not have been compatible with earth, possibly due to the people nuking the shit out of it, and they needed human derps to run their machinery for them while they sponged up enough resources to move on to another planet, perhaps even Titan itself. The nature of the alien tech and efficiency centric demands of the "Sally" lead me to believe that it was more likely a robot ship, though. Also, if you are planning on colonizing a planet after an invasion, blowing up the moon is likely not the best way to keep the biosphere intact, which was the aliens opening move. Blowing up the moon is actually relatively easy, incidentally. All they would have had to do is accelerate a big hunk of metal to near light speed aimed at the moon to do the job, so that part of the plot I have little issue with.
The only real plot hole that bothered me was how the penis mobile (as my wife dubbed it) was not remote hackable by the Tet or at least had hard coded programing to prevent it from shooting at the drones. The Tet's interest in the survivor also bugged me a little, as there was no explanation for their interest in the survivor. I would have also liked to know some more about the nature of the invaders, but I can understand that being limited to keep a sense of mystery.
Liked it well enough, but its not in my top ten or anything. I will be interested to see the director's cut down the road, however.