One thing I'm sure that everybody can agree on, is that there probably isn't another series as polarizing amongst it's fans than Final Fantasy. I disliked FFIX, I really don't see why everyone likes it so much. Just never got into it. I feel Zidane's design was probably the lamest design for a protagonist the series has seen. Some feel the series "died" after FFVI, I feel it started going downhill at FFVIII (well actually.. FFT). But all that is another topic altogether.
I think the "classic feel" the series once had left when all the old producers & programmers left to form their own companies. I mean, there's a lot of "spiritual successor" RPGs to Final Fantasy out there, from companies that employ a lot of former Squaresoft employees. To us old guys, of course things will never be the same as they once were in the 90's. But who's to say the newer, younger generation doesn't absolutely love the new style? To them, FFXIII is Final Fantasy. It's selfish of us to rob them of these experiences, just because it's "not what we grew up on." The direction the series took was inevitable. There will always be opinions like "yeah, while this new stuff is objectively 'good,' it just ain't for me," to "the series died once ____ was released," and everything in between.
But really, guys, in the end, every single Final Fantasy game is a fucking miracle. Wanna know why? Because we're no longer stuck in the stone age with 2-bit graphics playing Pong and Asteroids. It's amazing how technology progressed to offer these new experiences. We're all just spoiled rotten and everyone too often forgets how lucky we all are to have the stuff we have lol, it's true!