In terms of games that actually disappointed me, probably VII and X. XIII is certainly my least favorite entry but like Fynn mentioned, I didn't go into that entry with high expectations either.

VII starts off pretty strong and I still love the first disc for the most part, but then I felt just about everything falls apart in the second disc with the plot trying to figure out where it's going, red herring after red herring just to squeeze out another ten hours of "Who is Cloud" and the battle system loses it's luster as you start getting access to more broken materia and limit breaks that make the second half of the game more of a chore than actually fun.

X looked really cool and I initially loved the idea of it following one of my favorite Japanese myths, then I played it and was really underwhelmed. The story is slow, the characters are not as interesting as the writers would like you to believe they are because most of them are just basic archetypes we've seen a hundred times by this point or straw spokespeople for the various one sided themes the game is trying to tell. The battle system sounds great on paper but ends up being thirty to forty hours of playing matching as you bring in the right character to OHKO the monster. If you bother to equally level up everyone, the battle system slows to a crawl as you have to waste turns letting useless party members get a turn, weapon development sounds fun until you realize you'll almost always find something better from chests or monster drops until the end game, the mini-games are more annoying than fun, Spira sounds like an interesting place but the flow of the game due to the linear nature of it's design and the way the world is explained to you makes it feel like your stuck on a guided tour , and the twist concerning Tidus is just completely stupid and the writers trying too hard to come up with something mind-blowing without stopping to realize the cosmological ramifications of their choices. Overall, X is just kind of a chore to play for me cause nothing is terribly gripping about it, so I lose interest pretty quickly.

The After Years sounds cool on paper, a cool sequel to one of my fave FFs with a Duel/Triple tech system, hell yeah. Yet the plot is a sequel plot, new bad guy but the whole thing is just a ploy to basically recreate the whole story of the original but "differently". It's a shame too because several of the new characters are charming, but quickly drop off the face of the earth in the plot after their initial chapter. The layout of the plot and gameplay caused by it's initial origin as a mobile title is also annoying. I think the only plus for the game is the difficulty, but the final dungeon is a nightmare and I want Tokita to give fans an apology for that grindfest.

Revenant Wings seemed cool, a kiddie RTS title set in XII's Ivalice seems like a no-brainer to me but the game is to FFXII what X-2 is to X, a serious tonal shift that does no just service to the original material. Not surprising that the X-2 and RW were made by the same director and creative team. Watch as Vaan and Penelo lose their human traits so they can devolve into anime caricatures of themselves. Watch as major scene stealing characters of the original like Ashe, Basch, and Larsa show up to do nothing because they were contractually obligated to make an appearance. The plot has some interesting ideas but borrows way too much from FFX and diverges from the established Ivalice mythology a bit too much. The gameplay is also pretty bad, being 90% snore fest before it suddenly gets a ridiculous difficulty spike in the 11th hour.