There was a fan sneak preview for Titanic (3D) on Tuesday night where I live and so I went to that with a friend. The 3D was really impressive in my opinion. There was more people there than I expected, which is a good sign.
I can only imagine that since James Cameron was involved that the 3DS was top notch! Still the best 3D movie that I have ever seen is Avatar. There have been a few others that were alright, but usually I can almost just take the glasses off the movies are so bad. Tin tin was good, but the 3D was mediocre and unnessessary.