Having seen it, it wasn't tron, and it wasn't a sequel, but it was inspired by characters from the original. Some of the story elements were too truncated, and it's sort of like they skipped a movie. They invented too many events between Tron and Legacy, and then explained them in exposition. But as movie stories go, it worked. Kid loses father as a child. Kid grows up and goes seeking his father. He enters a mysterious unfamiliar world and deals with challenges, eventually finding his father and battling a foe. It's not a deep literary movie full of nuance, and it's not written as a complex and adult story. It's teen, or even tween, material, by Disney.