The rules changing from one movie to another kind of hurt. In the first movie a human "could" be derezzed. There was no blood. I suppose computer advancements could explain why blood could then be simulated, but it just threw the movie off for me to see it. The older movie felt more creative despite the lack of today's effects capabilities. The world in the older movie felt more like a person was inside a computer program as opposed to just being in a future based world. The main actor sucked in 2010 and despite the good acting from Michael Sheen, his character felt pushed. Users seemed weaker in the new version but that could just be attributed to being new in the world and having had CLU help make the world.
The first movie had a better sense of timing and did not feel rushed. The second movie felt as if it were trying to tell to many smaller stories at once. I actually think that TRON would make a descent Showtime/HBO format that could do a lot better for character development.