Saw Tron: Legacy last night, and I'm gonna second Dice's review. I thought it was cool! Perfect? Nah. But worth watching. My biggest complaint was with the sound. It was really, really loud. I wear earplugs at the movies because they're so loud, and there were times when it was too loud even with earplugs in. Of course, I might blame that partly on the theater. Also, there were times when the echo and "robot voice" effects were turned up way too high, and I couldn't figure out what was being said, earplugs or no earplugs.
OK, one other minor gripe: if they wanted David Bowie to be a character in the movie, they should have just asked David Bowie to be in the movie! That guy's up for anything, and he does a good job! (Remember his cameo in Zoolander? They just wrote that into the script, then said "Hey, David Bowie - you don't know us, but do you want to be in our movie?" And he said "Sure!" Because Bowie is awesome.)