While the picture in Wonder Woman does get rather dark at times, it's never totally obscuring. Considering a good portion of the second act, and most of the third, takes place at night, that's saying something. There are a couple of moments where the brightness actually does make you squint, in particular one specific moment during the film's final battle. However, there are some pieces of the film that turn out visually blah with the glasses on. Not to mention, there's a scene where Danny Huston's face is completely obscured by darkness, though it's thankfully brief. Your mileage may vary with this factor though, as not all theaters properly calibrate their rigs when swapping between 2D and 3D showings, which can hinder the brightness, and affect your individual screening.