What type of 3D projector also determines your experience. Because you watched in IMAX 3D, there was more 'popping-out' because that's what IMAX 3D is all about. I saw Avatar in Dolby 3D and everything stayed within the screen (or at the very least didn't pop-out into the audience).
Before the screening they showed the trailer for Alice in 3D and I was going "oh, is that it? Why does everything look flat?" Didn't realise until the other day that the reason was because it was done in post, not in camera, which explains a lot. Does this mean we have to wait another ten years for the second proper 3D movie?