Not all scenes were framed with 3D in mind, just a spotty few here and there to fulfill a 3D quota.
For instance Will Smith in a scene climbs down some of those metal scaffolding stairs you see on the sides of apartment buildings in alleys- it could have been an intense and immersive action shot like Hugo sliding down the spiral slide, but they just planted the camera 30 feet away, static, and wide, with no dimensionality.
The movie, being a comedy, also had many dialog shots, and they were all shallow focused closeups with nothing aesthetically pleasing about them.
The formula seemed to be, there would be a relatively exciting establishing shot at the start of a scene, followed by 3 minutes of boring dialog, and every ten scenes or so would have a gun or projectile stick slightly out of the screen.
This movie was about on par with Green Hornet. These kinds of movies should be exiled. I want people to stop thinking 3D is pointless just because the movies marketed to them typically have mediocre 3D. Hollywood needs to protect 3D's reputation by marketing the heck out of movies like Hugo and Great Gatsby and Life of Pi. "3D" will lose its luster if people only see postconverted moneygrabs like Star Trek 2, Avengers, and Men in Black.