You can "not like" the movie based on feelings, but its pretty sad to beat up the movie on technical merits. I mean they have to update a movie about technology from the 1980's to make some sense with what has happened since then while still preserving the original.
I think people who are arguing that the movie is bad and they can make that call because they are a programmer are lacking taste. That is an aggressive, exclusionary position to take in a potentially good conversation about the merits of a movie.
In my opinion, they worked very well with the challenges they faced. That an iso can come out of the grid is not for the viewer to judge as possible - it is possible in the world of Tron. Granted, it felt rushed, but if you would climb down off the high horse for a moment then you could reflect that there were several instances in the movie where the was clearly heavy script and content writing that were thrown out the window to make sure the movie runtime didn't go so long that it would affect the box office. Unfortunately, that took away from the completeness of the plot and ideological battles. However, in identifying what they WOULD HAVE DONE had they had the time, this movie was very good and was technically complete enough for me to read between the lines and enjoy the film.
I could take your arguments about why the original film was "better" technically and rip those apart to on a PHYSICAL level. Since nastiness has entered the thread, lets all remember the joke:
Failed Mathematicians become physicists.
failed physicists become chemists.
failed chemists become biologists.
The walls between disciplines are breaking these days, and I don't know where programmers fit in there, but its certainly not before mathematicians. We are all not good enough. But I digress into the metaphysical.