I thought this was a fine, quite enjoyed it, and it is always nice to see more of the Tron universe, so yeah, not a bad movie.
What is the Tron universe?
The original has a big mainframe, complete with groovy big digital scanner, that zapped a person in and then spat him back out without the designers/engineers of the hardware realizing this. That's literally the universe of Tron right there, the anthropomorphizing of what happens inside a computer, complete with a unique score that really fit the tone. Even the palettes chosen were very creative and thoughtful; the real world had everything and the computer realm had generally a red/blue affair, with others where needed. The multiple palettes in tandem made the movie far more compelling...
What felt like a few centuries later, "Legacy" is made. It isn't the same mainframe anymore and some code may have been ported over depending on the underlying architecture? I recall a temporal discontinuity between both the computer's clock cycles versus the much-slower real time of our universe, but despite buying the blu-ray I've no real desire to see it again. (The original, dated f/x or not, still has a charm that transcends and the low polygonal count also adds to the truly surreal nature of the universe that the sequels also miss out on.) The new costumes also looked too generic due to the symmetric look. The use of the then-trite teal/orange palette was pretty dour as well. Correct me on this in particular, but didn't Legacy's "real world" scenes also feature the same bland duochromatic palette? The orange looks great on a smartphone and the teal looks great if you're an extra in a zombie flick, probably.
A few more centuries go by and now "Ares" is conjured up. This one feels like it's got some potential - but how could the computer independently break its programming to program its way to break into our world? And would you want that to happen? Not all robots end up all sweet and charming like Data or Kryten when they work around their programming, which still remains a sci-fantasy staple.
The best part is this: All three Tron movies have the identical weakness: See that snake-like thing along the floor? Follow it to the wall, unplug it, and voila: End credits.
Like
Knight Rider versus its sequels and remakes, the original Tron had a certain spark and charm and freshness that hit all the right notes that the latter entries didn't quite have.