I got the game last Saturday and am still currently going through Chapter 1, having clocked in about 8 hours so far. I'm really taking my time with it though, with most of the side missions being pretty enjoyable. As for the light-hearted take on the story, I think it is quite refreshing for the series, and most of the humor can be appreciated.
With the faster-paced battle system in place, I enjoy it a little bit more than the one used in FFX. It's fun to try and chain everyone's attacks together for greater damage and changing jobs on-the-fly mixes up the strategy and techniques used in battle. The job transformations are pretty to watch, but they do get annoying after awhile; but since the animation can be shortened in the Config menu, problem solved. And since there is a great variety of different dresspheres to obtain, even the coveted "special" dresspheres, the battle system looks to keep fresh for a long time to come.
Things I'm disappointed with so far: Paine's voice is too dull, even if its meant for her personality; and Sphere Break- eh, not too excited about it.
Maybe not better than FFX, but certainly a very good game in its own right.