Internal inconsistency in films

This week Kat and I went to watch District 9. It got me thinking about the things I pick up on in films. I am a fan of many films that do not get great reviews. I like shallow films, big action, bit guns car chases, explosions etc. I don't mind a lot of the things that critics seem to complain about when they review a film. However, I do have a thing about internal consistency. I need to feel like the plot and actions make sense in the context of the film.