FF7 is definitely a masterpiece. It's story and battle system were amazing
The mythology behind the Fabula Nova Crystallis is magnificent. For anyone who hasn't read up on it, if you played FF13 and FF13-2 currently, I highly recommend you do. It'll give you a much more in-depth understanding of the plot encompassing both FF13 and FF13-2, and even the upcoming FFV13
FF13 was beautiful graphically, by like everyone says (with reason) it was too linear. You couldn't explore on your own. I liked the story though, but I don't like the feeling that someone's holding my hand throughout the entire game
I'm playing FF13-2 right now and I'm certainly enjoying it. It's improved so drastically from FF13 that it's impossible to compare the two on the same ground.