If the movie is shot is 3D aesthetically, the outcome can be good. Avatar had one of the best 3D effects.
But movies which use 2D footage to convert to 3D in post-production are gimmicks indeed. It's just a way to grab cash from the audience who are all willing to dole up twice the ticket price to catch the movie in 3D. The studios haven't yet learned, and many more 2D shot movies are being released in 3D simultaneously, one example being the upcoming Ironman 3, they never learn.
But movies which use 2D footage to convert to 3D in post-production are gimmicks indeed. It's just a way to grab cash from the audience who are all willing to dole up twice the ticket price to catch the movie in 3D. The studios haven't yet learned, and many more 2D shot movies are being released in 3D simultaneously, one example being the upcoming Ironman 3, they never learn.