2D>3D is getting better. I recently bought a 2012 LG LM7600 TV and the 2D>3D conversion is markedly better than my 2010 Samsung 3D plasma. The LG gives me control for both depth into the screen and convergence in front of the screen and by playing with those settings I've gotten some pretty good results. It will never be mistaken for native 3D, there are still stretches where the sense of depth is negligible (especially with fast camera movement), and in your face 3D pop out of the screen really doesn't happen but the illusion of depth is more consistent and persistent.
The problem is that 99% of films were not designed with 3D in mind so the extra dimensionality, even when done right, doesn't add much to the experience and ends up being a novelty that is turned off after about 30 minutes.