I've seen a few professional reviews that seemed off, like they were repeating from a script. That script is that Oblivion is totally derivative. This may seem plausible except that if you've seen Oblivion you haven't seen much of the movies it's supposedly ripping off.
Then I guess you've missed a lot of movies, because this is one time the paid reviewers got it absolutely right. I lost count listing all the movies it cribbed from in my head. (And cartoons. That blown-up moon looked like they took it right from Thundarr the Barbarian.)
Doesn't mean it was a bad movie. A good science fiction story and decent acting all around.