I think I may have seen Tron, the original, when it was made. From what I read on wikipedia the story was lacking. Still no reason not to appreciate a movie.
People saying TRON: Legacy is just some 2 hour CGI Daft Punk music video banking off the nostalgia of the original film and doesn't have anything to say as a film or a work of art. People who appreciate the story of a creator messing up his world by grooming his copy to be too much like him and has him reflecting for 20 years how much he wasted his life searching for perfection instead of appreciating the imperfections of life and his son, who in the end comes to save him only for his father to atone for his mistakes by sacrificing himself for the chance of his son and the last ISO to have a better life than the one he wasted.