I watched Tron: Legacy in 3D this morning. I really enjoyed it, but there are a few points I want to nitpick about (the following contains SPOILERS!!).

The 3D effects were very underwhelming. Much of the movie didn’t use it at all, reserving the effect exclusively for “in the Grid.” And even “in the Grid” it was nothing spectacular. In my opinion, the movie is just fine in regular ol’ 2D. It’s not worth paying the extra money for this one.

I wasn’t very happy with the CGI Jeff Bridges. It looked good at times, but at other times did feel very uncanny valley. Maybe this was intentional to reflect that Clu was the evil “fake.” Or maybe I’m just a bitter Computer Graphics major who’s had to write reports pointing out where I think the 3D looks “wrong” in certain movies and can’t appreciate a good effect anymore.

One plot point that I don’t recall being tied up: when Tron fell into the lake, he was shown returning to his normal state of mind, back to his “blue state.” And then he was gone. It didn’t show whether he actually died or not. I figured he was going to have a role in saving the good guys at the last minute, but he just disappeared. I felt like it was setting up a foreshadow to something than fell flat. However, it could be this was left open simply for the possibility of another sequel.

But other than that, I really liked it. Definitely worth a watch, but the 3D isn’t necessary. Good story, good action and overall decent effects.

UPDATE 12-19
Spoony’s review makes some great points (language warning, NSFW).