This was THE show to build the Tron franchise. None of the movies, past, present, or future could possibly create the depth of canon that this show began to do. The series was almost identical to the 2010 Tron Legacy movie storyline, and followed it exactly except for one brief but important change. To keep from ruining it for you, I'll just say that the "difference" is covered nicely in the last episodes.
One of the things about this series that is surprising is the incredibly high production quality. Every episode is blu-ray quality, with movie level effects, animation, acting, visuals, and sound. There are top names in the voice acting, like Elijah Wood and Bruce Boxleitner (among others). After watching a few episodes it will be clear to you that producing this must have cost Disney a fortune.
That's where the heartache comes in. The show had good ratings on Disney's main network, so they moved it to their pay-subscription XD network, which was dying, to help save the channel. The XD channel has ultimately been a failure, and naturally Tron Uprising lost ratings when it was switched from a free channel to a pay channel. Disney then cancelled the show citing "low ratings".
It amazes me that Disney, who is now the franchise king, has such short sightedness that they couldn't see (or didn't care) how this series could have turned Tron from a cult following into a mainstream IP on par with something like Transformers. Disney literally shot itself in the wallet by cancelling the show.
You see, unlike the movies, there was time for the series to develop both backstory and individual characters with a depth not possible in any movie. Tron fans get to visit the history of the grid, see current events, and future happenings in great detail. We get a look at the rich tapestry of life in the grid outside of what the movies could show us. We find out that Flynn and his son are not the only heroes with stories to be told, and that there is "life" in the grid worth fighting and dying for.
As a software developer myself, and fan of the Tron concept, the anthropomorphistic storytelling is absolutely incredible. It's hard to ever view "programs" the same way again. While the movies hint at this, the series dives into the deep end of program purpose, feeling, choices, and destiny.
Add to that the deep social commentary on revolution and oppression, and thinking adults find themselves mesmerized. Children will enjoy the show, but only adults will truly understand the deeper nuances. It's the kind of really rare media that a parent can not only watch with their kids to the mutual enjoyment of both, but also have meaningful conversations about afterwards. As a result, I often found myself discussing real life issues through the context of the show that I hadn't expected to be talking about for years to come.
Like all cancelled series, I hold out no hope that it will be brought back. At this point all we can do it is enjoy what was made, and try to draw attention to this crown jewel in the Tron franchise crown.