I've barely played I-V really loved VI, I didn't like VII, VIII was ok, loved IX, enjoyed X, I think XI was their first MMO thingy? I never got around to that one or XII for that matter. I actually like XIII unlike most people XIII-2? Not so much. XIV is another MMO which I didn't bother with and XV looks amazing. Though my favourite is probably VI, even though I'm not all that big into retro stuff.