It could go either way. Lots of the original people are involved...
Also, it's helped by the fact that the original Tron was pretty pulp-y and had a very basic plot. The only things that distinguished it were the revolutionary special effects and the emphasis on the emerging medium of computing. All Tron Legacy really has to do to live up to its predecessor is to have fantastic special effects (which it looks like it does), and a passable plot and script.
I do like that Daft Punk are doing the score. It's rather apropos.
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If songs were lines in a conversation, the situation would be fine.