Not only was this movie a visual / aural feast, but the 3D was really well done as well. I think the 3D actually helped the light cycle / light jet sequences feel better by better defining the scale and spacial relationships.
Major issues I have with the movie:
1) Did Flynn know that he'd be unable to un-create CLU without killing himself, and if so why in the holy fuck did he create CLU? The whole "no he can't do that or he'll destroy himself" thing is really really contrived and stupid and doesn't work at all.
2) Flynn is god. He creates stuff by touching a wall. He created CLU. Why is it just the three of them going to the portal and not, say, the three of them and their army of dudes that Flynn pulled out of his ass and the cyber tank battalion he created. I can understand why you wouldn't want that sort of logic interfering with your plot, but you need to rewrite and get Kevin Flynn out of the picture if you're going to just ignore his powers anyway. The guy who controls the system is god. Perhaps Kevin loses control? Maybe Cillian Murphy's character takes over the system and as such becomes the all-power god of the system?
Or maybe the users should all have a limited set of 'powers' that allows them to influence certain things and break certain rules but not totally alter shit? In that case, tho, you're looking more at The Matrix than Tron, I think. They don't really clearly establish the rules for the users. In the first film, Kevin could do things that would have killed the programs, and you don't ever really see him get hurt too badly. Was he impervious? The MCP didn't seem to think he was. He could also get the downed rectifier to work. He wasn't pulling new programs out of his ass or anything, tho. He wasn't reshaping the world. He was just more powerful and less damageable. In this movie he's a god, and that's kinda weird. When he created CLU, he wasn't writing code, he was telling the system to create a clone of his program and give it a specific function. But if that's the case, why couldn't CLU do all the things he could do. And why even bother making it a clone of yourself if you weren't going to allow it to do the shit you could do?
GRAAAAAHHH!!!! It's so frustrating to think about...
3) if you're trying to create some kind of utopia, why would you create rectifiers and tanks and weapons and the game grid in the first place? Programs die in the game grid, for fuck's sake! Is Flynn an evil bastard or what? And since when is the 'perfect system' a system where you slowly eat away at the limited population by murdering them all in a gladiatorial arena? CLU couldn't make new programs, right? So he was killing his potential army dudes and subjects, right?
I think the movie spends too much time jerking off over the first movie instead of having it's own ideas and such. Granted, you need conflict, and I think the suggestion that a virus or Cillian Murphy's character going in and corrupting the world would be a worthy excuse to put some of that stuff in there, but I get a sense that this isn't necessarily a sequel to Tron, but a really expensive fan film that got theatrical release.
4) Why the hell would you bleed in a virtual space? In the first film, it would seem that Flynn has been converted into data/a program and simply has some extra abilities as part of his complexity or something. This movie makes it seem as though you're just a regular person that's been transported into a computer or something. It doesn't make sense. They shouldn't bleed. It undermines the whole "this is gonna change everything" speech, because it literally changes nothing, and I think it undermines one of the main things they were trying to go for in the film.
Flynn talks about how the Grid could change medicine, religion, philosophy, etc, but they don't say why. However, imagine being able to take a paraplegic into the grid and then 'debugging' them the way they debug Quorra. Then you pop back into the real world perfectly healed. The ramifications of something like that would be huge, and I think that's what the movie was trying to go after. If that was what the movie was trying to go after, then they should have just come out and said it, or said it more clearly than they did. Making the users fundamentally different in that virtual world, tho, breaks that idea quite a lot.
But even with those problems and the disappointment that the film didn't explore concepts like the internet and all the different technologies that have come since the early 80's, I still liked this movie for the same reasons that some of you guys liked it. It's just nice to sit back and chill out to some awesome music and visuals and some really great cheesiness. The first film was equally cheesy and pretty to look at (even today it's still got some moments that look awesome), but this one has the advantage of not being boring as hell for 50% of it or so. The first film is sloooooooooooow.
One final thing: I never felt like Quorra and Sam had a romantic thing going. I felt like they had more of a sibling thing going on that only started to veer toward a romantic thing right at the end of the film, but only slightly. For some reason, that really endeared me to the characters a bit. I probably would have liked the movie less if they had gone after a more romantic relationship with those two.
And, yes, the last shot in the movie is really good. Olivia Wilde is adorable.