The battle system is totally different from X, it's fast-paced with an emphasis on changing character classes on the fly-- kind of a proto-FF13 really. What people usually have a problem with is the tone, which basically amps up the silliness and triviality. But the gameplay is solid.
Thanks for the insight, does not sound like my cup of tea so I might just let my memories be. FFX still looks amazing in my head so I am probably not missing much.