Just got back from Tron: Legacy.
Enjoyed it. It was a decent movie, especially for a sci-fi one. I did see it in 3D and I will say the following about that added dimension:
Tron 3D = Avatar 3D. The 3D is pointless and not worth the extra cost. It adds nothing and is undoubtedly just as good a movie without being in 3D.
(Avatar is the only other movie I’ve seen in 3D since that particular movie started this most recent 3D craze.)