First of all, I want to make clear I actually LIKED the movie. It was not something I could qualify as awesome, but it went right up to my top 10 guilty-pleasures.
Anyway, let's go to the point: meaning of the question marks.
First, the second: it means that I don't know if I am going to say something that is really not expected for anyone familiar with TRON universe. So evaluate if you are at risk of having the movie spoiled by reading this. I relieve myself of all responsibility.
In the first movie, TRON is a program Adam (main character Flynn's friend) designed to "finish" the Master Control, who was ruling the net (world inside computers, to put it some way easy) with iron fist. Of course, that was no easy task and TRON was held prisoner. By a series of actions, Flynn ends up inside the net and helps TRON fulfill his task.
So, part two. As it is called "TRON: Legacy" you would expect it has something to do with TRON, but nothing further from the truth. It's actually all about Flynn and his son. TRON appears just annecdotically (does that word even exist? anyway...) and, in my opinion, could have been left aside completely. For me, his appearing on the screen seemed a bit forced, so as to have an excuse to call the film "TRON: Legacy"(cause, by the by, it is way cooler than "Flynn: Legacy", or so, and much more related to the first part of the movie).
So!
Rating: appart from the deceptive title, great work.
