So I finished FF13 and I think the gameplay was wonderful.  This marks the second game I've completed in 2010 (other being Mass Effect 2) which probably is a record, when it comes to me and completing games.   FF13 structure-based spoilers below.
 
Back to FF13, after I beat the game I went back and did around 30 of the missions plus a lot of aimless wandering.  Total clock time on the game was 60hrs.  I did grind after the end of the game but, like FFX, it was all done on my own terms and entirely for optional objectives so I was able to stomach it.  When I realized how much time it would take to deck out my characters in optimal gear I put the game back on the shelf, still satisfied with the time I spent with it. 
 
Fun game.