Well we went and saw this yesterday in 3d. It was a good popcorn movie, and I would have enjoyed it without the 3D on dvd. As for the 3d, I did not think it was much of an improvement over what James Cameron did with T2-3D 15 odd years ago. There were some fun points, but alot of the stuff was very blurry. It did hurt my eyes at some points. It also defeats the purpose of 3d if half of the 3d object is "out of frame".
I have heard that Peter Jackson plans on releasing King Kong in 3d, and that would be badass. I felt he intentionally filmed the movie to translate it to 3d anyways (he is one of the big pushers for RealD).
Long story short, it was a fun movie with some fun 3D stuff. It was worth seeing in the theatre, but I don't think I will see another full-length 3d movie with the same technology. It is a technology that should be limited to short 10-20 minute amusement park attractions.