Honestly the original TRON movie didn't focus very much on the Tron character either. :shrug:
It's kinda like Mickey's PhilharMagic...his name is on the show, but you only see him for 30 seconds
I agree that Tron had very little to do with this latest installment, but disagree that he had little to do with the original. Tron was a program designed by Alan Bradley to monitor the Master Control Program. Tron, with Flynn and Ram, battled his way off of the game grid, and traveled to the I/O tower to download information onto his identity disc which would disable the MCP. He then travled to the MCP, destroyed Sark, and then the MCP with the help of Flynn. Without Tron, the MCP would not have been destroyed, Flynn would have not left the system, and Flynn would not have retrieved the files which made him a millionare and CEO of the company, so Tron did have a lot to do with the original.
As far as the new film, I agree that Tron should have had more to do with it. At first, I wasn't even expecting him to be in the film. I thought of Tron in a more general sense as the world of Tron meaning the computer world and not the character himself. But I now agree he should have had a larger role. It would have been nice if the fact that Tron helped to design the system would have had a greater focus, and maybe he could have been in a leadership role at one time. For those programs who remembered him, they could have thought of him fondly relative to the current leadership, although most programs think of CLU fondly because they are brainwashed to beleive that his way is correct not to mention the consequences for disagreeing, illustrating simular parallels to nazi Germany.
Another story point which could have been focused on more could have been the whereabouts of Tron meaning no one knew what happend to him. These programs that follow Clu could have also been led to beleive that Tron abbandonned them. I would have liked it if the story partially centered around the Flynns and Quorra finding Tron because Kevin Flynn believes he is the only one who could defeat Clu. At the midway point, after death is avoided numerous times, Kevin could reveal he believes Tron to be dead. Kevin would justify the lie two fold saying that finding Tron was figurative because they have to find the bravery and nobility within themselves, and also that Flynn wanted them to have some hope against seemingly insermountable odds; at first by looking for a program that could defeat Clu and then eventually proving that they can do it without Tron.
Then, at the end of the film, Sam would face Clu one on one in an epic battle. Clu would eventually come out on top, with Sam cowering on the ground and scooting away from Clu with his light disc ready to strike. Just as Clu is ready to deliver a fatal blow to Sam, with Quorra looking on in horror and Kevin saying "NOOO!!!!", and Sam closing his eyes in acceptance of his death, Rinsler comes from nowhere to block the strike. Clu asks angrily "Rinsler, what are you doing??!!". Rinslers face plate comes up revealing that he is actually Tron, and his color slowly changes from red to blue as he says defiantly and passionatly, "My name is Tron, I fight for the users!". Then, another amazing battle would commence.
I like the film in its current state, but I would have liked a scenario like this better.