The movie was about hierarchy, and the irony of reflection; the John Goodman character is no different than the aliens above surface.
But that can be a problem. 10 CL is meant to be a sci-fi film, yet spends 3/4 telling a story about abuse of power, and social dynamics.
The flaw is the lack of subtlety; many great movies will be a genre film, yet subtly represent an idea totally unrelated to the nature of the genre (examples being The Terminator, or The Conjuring 2, or Revenge of the Sith or Scream and perhaps Spectre).
10 Cloverfield Lane isn't just failing to do that, but is making no effort to cloak its idea from the plot (the Goodman character is so blatantly abusive, and domineering).