I liked the original, Really liked TRON: Legacy for the most part, but really don't know where they'll take the story. Being honest, TRON: Legacy basically went through a lot of the same steps as the original...I forget the term for that.
Also, Jared Leto is often considered not a great actor, or at least involved in a lot of bad projects, so him being involved has led to a lot of people being skeptical.