Interesting debate. I was literally having a massive rant about how utterly shite 13 is, just a few hours ago.
For those that want re-made older classics (well 3 and 6 for sure, i think they've done 4 as well) go and get a DS, they've been re-made on there and they're still amazing (although I still play the gameboy advance versions because i'm a retro lover)
Vii is still the best, then 9, then 8, then 12 and then 10. I don't get the love for 10, i hated the characters in that almost as much as I hated the emo twat in 13. Almost. But Square enix have lost me i'm afraid, unless vs 13 is going back to just turn based and a proper party system, i'm not bothering.
FF13 had the single worst battle mechanic that i've ever played. It was uber toss and nothing anyone will say will ever make me change my mind on that.
Oh and Kash, I'm feeling the Vivi love, best FF character ever, by miles!