These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Final Fantasy X-2
Angst? What Angst?: Gippal has considerably less angst about his past than the other three Crimson Squad members, since he's the only one who actually acknowledges Paine when he meets her - he excitedly says "you!" but plays along when she pretends they've never met.
Anticlimax Boss: Vegnagun, which can be taken down almost effortlessly if the characters' levels are above average. Then, the Final Boss is a piece of cake in comparison and has unoriginal movements.
An accessory that makes all hits do max damage when on low health, combined with the Gunner class's technique that hits an upwards of 20 or so times. What's more, this attack can be done during 1000 Needles, which lasts a good 10-20 seconds, and ensures the enemy can't attack. It's possible to string these together multiple times in a row for ridiculous amounts of damage one after the other. Yet, this is almost necessary to get through the Bonus Dungeon. There's a reason this game allows you to add an extra 9 to the damage cap. Un-broken in the International version, in which it also grants the user Auto-Berserk status, thereby preventing use of multi-hit abilities (although the Thief still gets two hits per turn, which helps).
Lady Luck's Random Reels ability, lining up three 7s using a combination of carefully timed pauses. This activates an ability called CONGRATS! which will bribe any bribable target (including all Via Infinito bosses except Trema) and give the player gil and all of the items, gil and EXP they would normally win for winning the battle. It's a cheap and easy way to win just about any battle, hampered only by the disadvantage that it takes a long time to activate and you have to survive until it does in order to use it.
The alchemist class has free healing potions as well as mixes that make you invincible. First strike, Smooth Sailing and Adamantine can turn a songstress into a tank and her terrible agility allows her to spam her songs the entire battle.
Two Dark Knights spamming Darkness + an Alchemist spamming Mega Potions = most enemies/bosses not exclusive to the Bonus Dungeon go down like chumps. What's more is that there's an accessory called Ragnarok that (when equipped) will stop Darkness draining the Dark Knight's HP.
The Special Dresspheres, so much so that some players play the game without using them, much like the Aeons from the previous installment.
When it was first revealed, the reaction of some fans was akin to "A sequel to a Final Fantasy game? WHAAAAAAAT?!" as it was the first time a Final Fantasy game received a sequel. With other games in the series receiving sequels & spin-offs since then, this has subsided to "It's not a sequel to MY favourite Final Fantasy game!" although there's still a portion of fans who hate this game for being the first direct follow-up in the franchise.
The game is Lighter and Softer than it's predecessor, with special note going to the dressphere mechanic.
Jumping the Shark: For many just the fact that a numbered Final Fantasy game got a sequel was a declining a point in the franchise. The fact that most of the game's design was directly recycled from the original and barely worked to provide a different experience did not help. The plot and style suffer a case of Never Live It Down.
Yojimbo's Zenmato does the same thing with the added bonus of depleting all of your MP. Unlike the Magus Sisters, that attack was actually worse when he was on your side, but justified in that keeping it that way would've made the boss fight with him next to impossible.
That One Boss: Far too many of the bonus bosses than should be healthy.
Nooj deserves special mention. Lightfall is what you NEVER want to see hit you. Not only does it drain MP, but it hits HP pretty heavily too.
Azi Daharka, a skippable boss. His normal physical attack is several attacks done as one attack (so you can't stagger him at all) and drains your HP, while his Damocles Photon attack does 50% of your max HP. The best part is that it's Lost Forever if you don't try to encounter it in the final dungeon.
That One Sidequest: The matchmaking/publicity sidequests, which require you to walk up to random NPCs and pick from a list of five statements, which will prompt either a positive or negative response from the NPC. The problem is, you're given no clues whatsoever as to which statement to pick for which NPC, and if you want the best results for either sidequest (which is required for 100% Completion), you have to be near perfect. In a sidequest involving the worst kind of Trial-and-Error Gameplay imaginable. You're thus reduced to either consulting a guide, Save Scumming to oblivion or blowing all your money at the Calm Lands building up rep the slow way. Even if you DO consult a guide for it; it's a GAME-Spanning quest!
They Wasted a Perfectly Good Plot: While dealing with the groups that emerged in the political fallout of the last game made for interesting final act, the game would have been a lot more interesting if that was the plot main story.
For some, the backstory of The Crimson Squad boils down to "oh, look, the Church of Yevon is made up of total bastards" ... which is something anyone who played the last game already knew.
The Good and True ending came out as completely random. There was no build up or reason to explain why Tidus revives two years after the events of Final Fantasy X and how is Shuyin's incident related wtih him.
Additionally, Shuyin's similarities with Tidus confused a lot of players and wondered what was their relationship. Word of God is that it is a coincidence.