You’ve probably read about how some theaters are neglecting to take off the lenses made for 3D films when showing other movies, and the result is a dim, muddy movie. There are a number of reasons for this, but the end is always the same, and Roger Ebert is fed up with it. He breaks down the issue and laments the state of theaters and projectors in this interesting blog post.
The take-away? If the movie looks bad, ask them to fix it or get your money back. Only the customers can keep theaters honest.