No doubt the original was much more visually groundbreaking and original at the time, but I still thought Legacy did a great job reimagining the world for today's audiences and coming up with a really cool and dynamic look that worked really well and felt unique enough from any other CG worlds we've seen recently....
Not unique in the same way, though. As I said, when CGI was new, the goal of CG animators was to embrace that novelty, that unreality -- the ways in which it was unlike anything in the physical world and thus unlike anything human beings had ever seen or created before. The original TRON was about trying to make reality look unreal. The live actors were shot on blank sets and rotoscoped into cel-animated environments that were drawn to mimic the look of CGI (because the technology to integrate live performers with actual CG animation didn't exist yet, so they had to fake it). They printed the film of the live actors onto blown-up animation cels, backlit them to create their glowing costumes, and essentially created an animated cartoon that integrated live-action people into it.
But in the years that followed, the unreality of CGI came to be seen less as a source of artistic novelty and more as an inconvenience in the effort to create computer-animated effects that could pass for reality. Legacy fits that aesthetic -- not trying to make humans look like CG animation, but trying to make CG animation look like physical reality. The actors looked real and solid and were shot on physical sets, and the aesthetic of the digital environment was designed to mesh with the physical sets, to look as real as they did, rather than trying to make the physical look unreal. It's a total reversal of the design goal. The makers of the original film even comment on this on the DVD features -- not about Legacy specifically, since it hadn't been made yet, but about how that early experimentation and embrace of the unreal has been abandoned, the art form becoming constrained to mimic the appearance of the physical rather than being expanded further beyond it into the abstract. (Even 3D-animated movies with highly distorted character designs, like Pixar films, still go to great lengths to mimic the physical textures of hair, skin, fabric, the natural environment, etc.)
So sure, it created a distinctive look for its environment, just as many other films do, but the basic principle was still the same, not as fundamental a departure as the original tried to be. It was still about building real sets and making CGI look like it had solid substance and texture, and that's not the aesthetic the original aspired to. TRON was basically an animated film that tried to make human actors look like computer animation, because the technology didn't exist yet to create actual CGI human characters. TRON: Legacy was a live-action film using CGI to supplement the live action, just like every other modern live-action movie.
Really, TRON: Uprising came closer to matching the aesthetic aspirations of the original movie, because it actually was a cartoon. Its characters looked human, but unreal, which was what the original filmmakers aspired to. Also, the performance-capture Clu in Legacy was something the original filmmakers would've loved. Performance capture is the culmination of their baby-step experiment with turning live performance into computer animation. Really, Legacy would've been truer to the original intent if everything inside the Grid had been straight-up 3D animation, with the actors performance-captured.
Having never seen the original. I can definitely say the movie stood out on its own as its own separate story. Though I did like the fact that Captain Sheridan from B5 showed up in a supporting role.
Ohh, man, you really haven't seen the original, have you? Bruce Boxleitner was Tron! He was the guy the whole franchise is named after! Okay, Tron and Alan Bradley were technically supporting characters in the original, since the movie was told from Kevin Flynn's perspective, but Tron was the actual hero of the film.