I enjoyed it and really liked the original (old enough to remember when it was groundbreaking). I agree with others who felt it took a sharp turn towards suckage in the end, primarily because it was never adequately explained what happened to Tron, or what motivated him to turn and turn again. That was a big ass missing piece of the plot that was seemingly eliminated to keep the running time down.
But still, it was way cool. Looking forward to the next one.
I'm not mean; I just don't like you.