I'm playing FF 13 right now, and I have to say if you're a fan of the freedom FF games in the past originally had, you'll be disappointed.
After the battles, you instantly heal, and the pathways (until the end) are very linear. I'm sorry to say, but this doesn't really feel like the FF game many hardcore fans of the series would truly enjoy.
Also, the game can get very 'chick flick' like in some parts of the game. As of now, I'm running around with Vanille and there's some crazy 'happy song' playing in the background with some high pitched voice telling me to "Step into the rainbow."