Yes, for most movies it just makes no sense.
I think there are two methods to create a 3D movie, one (the good and expensive one) is to shoot with special 3D cameras, the other is to create 3D effects later on the PC.
"Titans" was totally worthless in 3D, that was also made on the PC afterwards to follow the 3D hype.
3D doesn't make a bad movie good, but i think it can be fun, i liked Avatar a lot. A whole new cinema experience to me.