3D is a gimmick. It always has been and always will be. Most of the films have absolutely no point in being in 3D. Why the hell was Streetdance in 3D? It added nothing to the film whatsoever.
It should be saved for when it'll look great. At the moment it's just a token value addition to the film which is there purely to make extra revenue. People go to see the 3D rather than the film.
It compensates for poor films, too, by being their saviour allowing for more ticket sales.