History YMMV / HatsuneMikuProjectDiva

** In the ''mirai'' PV for "Kokoro", the lines of code that can be seen in the background when Rin receives a heart are written in {{UsefulNotes/Python}}.

* CoveredUp: The series features a number of "Vocal Switches" for preexisting Vocaloid songs, such as there being Luka and Rin switches for Miku's "Romeo and Cinderella" in ''Project mirai'' and a switch for KAITO in Len's commissioned song "Terekakushi Shishunki" in the mainline ''Project DIVA'' series.

* FanonDiscontinuity: If a name in the localized version differs too greatly from the widely-accepted version, it is usually ignored, as fans prefer to refer to the songs with the names that they're comfortable with. This usually applies to the {{Woolseyism}}s that are kinda out there, like "Urbandonment" and "Although Songs Have No Form", the latter of which ''no one'' can agree on the translation of, and some of the TooLongDidntDub titles like "Roshin Yukai" and "Arifureta Sekai Seifuku".
** Not helped by ''Future Tone's'' English release reverting and re-translating several names, as if even SEGA can't decide the actual names.
** Some fans like to pretend the MV for "Kagerou Daze" doesn't exist due to feeling like it misses the point of the song. [[ArsonMurderAndJaywalking And also the module is bad]].

** One common criticism towards ''Arcade Future Tone'' and ''Megamix'' are that a decent cut of the new songs simply recycle their original [=MVs=] as opposed to getting proper 3D ones, with some extreme detractors accusing SEGA of getting lazy (not helping is the fact that quite a few of these songs, like Sand Planet, Dreaming Chuchu and Ohedo Julia-Night, were heavily requested songs prior to being added). Not only was it [[{{Misblamed}} the original producers' decisions to keep the original MVs]], but 2D [=MVs=] have been in the series' songlists since the very first game: "The Disappearance of Hatsune Miku", arguably one of the series' most iconic songs, originally had a MV that was just a [[https://www.youtube.com/watch?v=jlUNOz5ODmw slideshow of Miku fanart]] and didn't get a proper 3D MV until the release of ''Dreamy Theatre''.

** ''X'' giving the ''Project DIVA'' a storyline and characterization to the Crypton characters. While some players didn't mind the story and enjoyed the rarity of the Cryptonloids receiving characterization so long as it didn't conflict with their own interpretations of the characters, others felt the main story to be quite boring and unnecessary while also feeling like the addition of personalities to the otherwise BlankSlate Vocaloids was similarly unneeded.

*** ''[=Mega39's=]+''/''Mega Mix+'' notably fixes the setlist issue and also allows you to remove the fixed toon shader. while being sold at effectively the same price as the original release.

* FranchiseOriginalSin: Many of the criticisms fans have made towards ''X'' are aspects that had already existed prior in earlier titles.

* {{Misblamed}}: Many have accused Sega of being lazy or the like for using the original 2D [=PVs=] for certain songs in ''Future Tone'' and ''Mega Mix'' instead of making 3D [=PVs=] for them. However, the decision to use the original [=PVs=] over making new [=PVs=] was a creative choice made by the original producers of those songs, not an act of laziness or what not by Sega.

** ''mirai'' tones down the infamously strict timing windows from the main series and has generally more lenient mechanics.

** Mikudayo herself causes a lot of incredible screw-ups due to being extremely disproportionate. This includes the camera constantly zooming in on her forehead (where a regular model's head would be), lack of limbs causing her dance routines to look hilariously disjointed (which gets even better with supposedly "provocative" dances, like Blackjack), and constant clipping issues with various props. There are even song-specific things, such as KAITO's violin being removed entirely in "Cantarella ~grace edition~" and Mikudayo clipping through the floor in several Medleys in ''X''.

These examples only apply to the ''Project Diva''/''Project mirai'' series. For examples related to Sega's other Hatsune Miku-based rhythm game, ''VideoGame/ProjectSekai'', go [[YMMV/ProjectSekai here]].\\

* FriendlyFandoms: As both are ''Vocaloid''-centric games published by Sega, it's unsurprising that there is a bit of cross-over between players of this series and those that play the games "younger sister" mobile game ''VideoGame/ProjectSEKAI''. As of 2022, there are even several mods of the ''SEKAI'' versions of the Virtual Singers added to ''Project DIVA'', as well as requests for some SEKAI commissions to be added to the game as downloadable content.

* MarketBasedTitle: ''mirai Deluxe'' is ''mirai DX'' outside of Japan. Despite this, all versions of the game have Miku saying " Project Mirai Deluxe!" when you highlight the game's icon on the 3DS's Home Menu.

** ''X''

** ''Future Tone''

* WhatDoYouMeanItWasntMadeOnDrugs:
** The PV for "Matryoshka" is ''weird.'' It manages to be almost as, if not more, creepy than the original video, in spite of (or perhaps because of) the use of Nendoroids.
** "Denparadigm" is one of the only songs with an ''Arcade''-original PV that isn't made in Edit Mode. It also happens to look like a crack-induced fever dream hyper-compressed into three minutes and set to catchy, nonsensical background music.
* WidgetSeries: Unlike ''VideoGame/DanceDanceRevolution'' or ''VideoGame/{{Beatmania}}'', and ''VideoGame/RockBand'' and ''VideoGame/GuitarHero'' in the West, Music/{{Vocaloid}} was largely a niche property when the first game was released. [[AuthorsSavingThrow Then SEGA asked if the newest game should be localised.]] The reaction was immediate. SEGA never looked back.

* PolishedPort: The UpdatedRerelease of ''Mega Mix'' on Steam, ''Mega Mix+'', restores all the tracks that were missing from the Switch original, has the option to switch the toon shader on and off (effectively restoring the graphics to how they were in ''Future Tone''), and runs at a full (albeit locked) 60fps (the Switch original only ran at 30fps). On top of all of that, if you have the Steam Deck, you can play it on the go just like the original, but with the aforementioned benefits. While the port does remove Mix mode (since the mode is made exclusively with the joycons in mind) and it isn't without its downsides, such as occassional performance issues and the framerate being locked, the pros far outweight the cons in this case.

** Many fans were upset after ''Mega Mix'' cut a ton of fan-favorite and iconic songs from the ''Future Tone'' setlist (Ievan Polka, Roshin Yuukai, and the vast majority of MEIKO's songs among them) and some less-liked songs made it in in their place, including some examples of ThatOneLevel. [=MegaMix+=] rectifies this by reading them to the game, but it's unknown when these songs will make it back to the previous releases of the game.

* AudienceAlienatingPremise: ''X'' having a story mode at all was all but guaranteed to turn off fans, since a big part of Music/{{Vocaloid}}'s appeal was that they were {{blank slate}}s who can be used for anything and the idea of an story mode in an official Hatsune Miku work goes against that appeal. Even those who found the idea to be interesting however, were turned off by the story being effectively an ExcusePlot that does little with the potential it had, on top of using almost none of the pre-established ''Project Diva''-exclusive lore featured in the previous games' opening [=PVs=]. The story mode, combined with the disliked changes to the gameplay formula, the excessive grinding and the tiny setlist, is considered to have played a large part in ''X'' underperforming in sales.

*** "DECORATOR", despite being relatively concert-style, takes what it does best and runs with it, being an incredibly colorful and energetic concert based off ''F 2nd'''s opening PV that notably features all six characters (one of the only songs to do so), all to an incredibly catchy and upbeat song by Kz Livetune.

** [[AlternateSelf Sakine MEIKO]], Akita Neru, Haku Yowane, and Teto Kasane were popular additions, largely thanks for their preexisting popularity with the fanbase.
** As far as specific modules are concerned; while it is an minor module that has only appeared in a total of four games (''Extend'', ''Arcade'', ''Future Tone'' and ''Mega Mix''), the "Sonic style" module is one of the most popular modules in the entire series, for [[Franchise/SonicTheHedgehog obvious reasons]].
** You'll find quite a few people saying that "Urotander, Underhanded Rangers" is the best song included in ''Project DIVA: X'', with many expressing disappointment that it didn't make it into any of the games that followed.
** In a rare case where this applies to a ''cover'', KAITO's Vocal Switch for Len's "Terekakushi Shishunki" proved to be very popular because of the cute, youthful tone that is used for him the song.