Daft Punk did a fantastic job with this score. They took their usual electronic genre and began pushing and bending it, eventually creating something that will lend a fantastic backdrop to the mood of the film. What is nice is that I think the album is also able to stand on its own, alone, without the movie. I could easily put it into the same class of "epic, ambient music" as the Batman Begins sound track from Hans Zimmer & James Howard, probably because this film also has vast, sweeping orchestral arrangements.
It seems like some of the critics agree with me while others are a bit more critical of the album.
Overall? It does exactly what I'm sure Disney wants it to do, and serves to whet my appetite for the December 17th release of TRON: Legacy to theaters.