I love your enthusiasm for 3D :)
My opinion is that most movies, particularly those with 3D effects added in post-production, are not really worth it -- especially considering movie tickets are more expensive when the screening is in 3D.
If the movie is designed with 3D in mind, and filmed with 3D cameras, it's a different story. Avatar is the most obvious example. That movie, above all others, proves the usefulness of 3D movie technology. But no one has really built upon its success in the past three years.