I wasn't too sure about the character designs at first, but after seeing them in motion, I think they fit the action sequences really well. They explored a bit more of the Grid than they did in Legacy
and that was real cool. I like how the lightcycles aren't quite as sleek on closer look and have a more rounded forward canopy like the ones in the original Tron
Pretty cool story too, IMO, but I think they're deliberately leaving out something established in Legacy
regarding Rinzler that will be addressed by the end of the series.