Really cliched, I know, but that was the name of the last chapter of the game, so hey, not my fault ;p Anyway, I finished Tron: Evolution pretty fast, sometimes completing a chapter in a single sitting, which is really short compared to the epic-length RPGs I've been playing (Mass Effect and Dragon Age come to mind). Overall, it was pretty fun; I got to see familiar characters from the movie, visited various locales and got quite a bit of backstory, especially about Clu and the ISOs.
Main regret? I didn't get to fight Rinzler. I know it would have been cutting it pretty close in the timeline, but man, I would really have loved to go head-to-head with him.
Main annoyance?
Everyone died. And by that I mean all the introduced characters that didn't have to survive until the movie. I was rather disappointed when Gibson died; he was funny and irreverent and still surprisingly capable of getting the job done. And then, at the end, they killed my character and I got really annoyed. Sure, Anon didn't appear in the movie, but that doesn't have to mean he died at the end of the game, right? I've always felt that the death of a player character should be the gamer's choice, otherwise it just detracts from the rapport built up through the game.
Plotwise, the game takes place between the original Tron and Legacy movies. The player takes the role of Anon, a System Monitor created by Kevin Flynn to investigate the murder of an ISO during the games. Anon arrives in Tron City just in time for a ceremony to appoint Radia, leader of the ISOs, as a co-administrator together with Clu. However, the ceremony is disrupted by a virus called Abraxas. Soon after, Clu confronts Kevin about the virus, saying it evolved from one of the ISOs. This is the root of the conflict between Kevin and Clu that we saw in the movie: Clu sees no place for these potentially dangerous ISOs in his perfect system, but Kevin sees them as a miracle, saying they should be allowed to exist.
Clu attacks Kevin and Tron soon after, just as we saw in the flashback sequence in the movie. Anon, together with Quorra, set off to look for Quorra's friend at the End of Line club, hoping to get the warning out to the ISOs. Zuse, at this point, is an open friend to the ISOs, welcoming them to his club. Unfortunately, this ISO haven is one of the first that Clu hits. Anon and Quorra flee the chaos and head out to Arjia City to find Radia, where they're told that Flynn wasn't killed but was rescued by a program called Gibson and brought to a hiding place in the Outlands.
These are the bits most relevant to the movie, but there was also one interesting revelation at the end of the game: Clu was apparently in league with the Abraxas virus. It was Clu who befriended the ISO and then caused him to evolve into a virus. Clu then used the chaos sown by Abraxas as an excuse to wipe out the ISOs. It is then deeply ironic that Clu shares the same yellow coloring as the virus and infected programs. As though Clu himself is corrupted, and by repurposing other programs for his army, he is acting exactly as a virus would.