I personally didn't enjoy the game, I could see a little kid enjoying it. I first played FF when I was about 7, and I loved it.
As I grew older the J-RPG mechanics started to bore me, and now I'm a bigger fan of platformers and action/adventure games (think Prince of Persia).
All in all, FF13 is by far my favorite FF game, but I don't like FF games. Take that as you will. It removed the pain points of the older games, while not being overly easy. I'd say it's perfect for kids.