5 reasons why FFXIII is the best in the series. Agree or disagree?

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Xxain said:
The Battle system is NOT new!!!!!!!! ...... Grandia has been doing FF Xlll since SEGA SATURN!!!!!... Hell no FF Xlll isnt the best it doesn't even change my top 5

Care to explain this? I don't see how FFXIII's combat system is the same as Grandia's. I must have missed something.