I hate 3D movies, or anything that FORCEFULLY try to use 3D as a selling point. Movies like Avatar was an OK usage of the 3D technology, as it does really shine out and intentionally use 3D technology to show its unique properties and bridge deeper elements of the movie itself. While pitiful movies that forcefully uses 3D just so they can jump onto the hype wagon like Clash of the Titans is just... No. Just no.
In my opinion, 3D also impairs the quality of the movie itself, sometimes I just felt 3D is just meant to show off the technology and adds no redeeming value to the movie itself. What it adds is just searing eye pain. Especially if you wear glasses, then you also have to wear the 3D glasses itself on top of it. Practical? no.
I suppose right now the technology is in transition before it can become perfect 3D. Until that time comes,I would have to say I find it hard to really appreciate 3D movies.