I wish I had the time to get sucked into an MMO, because FF14 sounds like it would appeal. (though if DQX ever got released, that would be the game to pop my MMO cherry). And as far as spinoffs go, Theatrhythm Curtain Call is really great (even if its art style sucks), I heard the mobile games are pretty fun if you're into that F2P gatcha (I'm not), and World of FF has gotten lots of positive press. So yeah I agree with Positive that the FF series isn't in the shitshow state everyone makes it out to be...
Still, I expect FFXV to be a mess of underdeveloped gameplay systems, an incoherent storyline that had large chunks of it lobotomized, tons of technical issues (framerate drops, stuttering, glitches, even the occasional crash), large empty areas filled with generic "kill 10 boars" quests, a typical Shimomura soundtrack with lots of violins and harps (I like her 16-bit era stuff a lot but after that I can't get into), and the occasional badass setpiece battles. Will be worse than FFXIII because at least that game was polished to a glossy sheen and the soundtrack was fucking amazing. Will be better than Lightning Returns because putting a hard time limit in a nonlinear open world game (that was built on an engine made to handle linear corridors, not large nonlinear open worlds) is one of the dumbest ideas ever.
Still, plenty of people will hail it GOTY.