Just saw it with my son and my ex (Thomas really wanted to see it with 'everyone'. He got his Mom and Dad and seemed happy with it). I really enjoyed it, for all I have a couple quibbles and there were a few places I thought it was a little obvious, but then I have been watching movies for .. how many years now? I am just not going to be easily led anymore.
But, a couple things occurred to me to question this time, that never even entered my head with the first Tron, and should have.
A) Why does gravity work? And, worse, why doesn't it work on everything?
B) The whole programs-as-citizens thing doesn't scan well for me.