Hot Damn Holy Shits Tier
1.
In a world were all the Crystals have disappeared from their kingdoms, Lucis, the only still holding one, has evolved in a contemporary, highly developed but isolated nation (allowing for the technological advances to be focused on daily life, while magic deals with defenses and such), while other countries remained in a medioeval-reinassance state, devolving their resources in the bellic field. One of these kingdoms, Niflheim, now an empire, decides to invade Lucis and steal their Crystal, moving Prince Noctis to start his journey. The political/ethical contrast between First and Third World countries is something really mature and very different from what we usually get in a FF. The fact that aside from Lucis, which is comparable to our society, the rest of the world is filled with giant creatures and creative landscapes also add to a very compelling realism/fantasy-technology/nature contrast.
On top of that, dark GoT-like conspiracies, possibly a Romeo&Juliet-like romance and a road trip movie feeling ti create a better bonding between characters and to give the plot air to breathe, the just has all the ingredients to have the best FF setting ever.
2.
A world at war, with every Count, Duke and whatever all involved in various conspiracies and treasons, and amidst this two best friends choose opposite pacts in these factions? Sign me the fuck in.
3.
Again, empires at war (yes there's a recurring pattern in my tastes) drag a small kingdom in their clash, bringing together various characters, rebel princesses, thieves, knights and wannabe airpirates with a shelf-like personality, in a world filled with many creative landscapes and inhabitated by various races.
4.
In a more fairytale-ish/child-esque world than most FF worlds, a band of thieves enacts (pun intended) a plan to kidnap the princess of a kingdom, then shit hits the fan, draws together many pictoresque characters and set in motion a bigger-than-expected adventure.
Hells Yes I'll Play That Tier
1. FFVII - An ex-Soldier with a dark past in a cyberpunk world? Hell yes. I didn't put it higher just because i find the premises interesting now, didn't care much when i was little.
2. FFX - The mysterious boy come from God-knows-where ends in a fantasy worlds, nice.
3. FFXIII - Cool futuristic/wilderness contrast with Gods and predestination. Ugh, such a cool concept...
4. FFT0 - MOAR WAR AND PLOTS FOR EVERYONE!!!
Sounds Cool, I'm Excited Tier
1. FFVI
2. FFIV
3. FFIV
The others Tier
All the others