''VideoGame/ProjectM'' aims to satisfy the UnpleasableFanbase of ''VideoGame/SuperSmashBros'', but that doesn't stop it from facing some divisiveness of its own.
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* AwesomeMusic:
** As of 3.5, ''Project M'' now has its own [[https://www.youtube.com/watch?v=dMH_2kpRuUM main theme]], composed by Phonetic Hero. It is absolutely glorious, even incorporating a section of the ''Melee'' menu theme.
** 3.5 added a streamlined version of the Hanenbow stage. Since the dev team didn't like that it had no music in ''Brawl'', [[https://www.youtube.com/watch?v=VW2aRXu6Gy8 they made their own]].
* BaseBreaker:
** Falco, whose animations were changed back to Fox's. While people who liked Falco above Fox in ''Melee'' are glad, people who have a distaste for true clones are not.
** Lucario, whose signature Aura mechanic was removed due to allegedly "rewarding bad play". People who were drawn to Lucario by the mechanic in the official ''Super Smash Bros.'' games consider PM!Lucario to be a direct insult.
* BetterThanCanon:
** Some dedicated tournament players consider it better than any of the ''Smash'' games officially released by Nintendo due to its higher level of balance towards high-level play (when it's usually balanced at low-to-mid-level play), greater mechanical depth and greater speed and precision required to play.
** As the game grew more complete, it began to be more universally accepted as its own installment in canon rather than just a modification of ''Brawl''.
* BrokenBase: Several members of the ''Smash'' community still prefer ''Melee'' or ''Brawl'' over ''Project M'', though the situation has been getting better with big name ''Melee'' and ''Brawl'' players' participation.
** Want to easily start an argument? Bring up whether Fox and Falco should be {{nerf}}ed.[[note]]Basically, they're controversial because they're generally considered two of the best characters, but are also very [[GlassCannon fragile]] and have fairly [[DifficultButAwesome tough execution]].[[/note]]
** One user had leaked Project M's Clone Engine and [[http://forums.kc-mm.com/index.php?topic=67706.0 codes]].[[note]]At the time, BrawlEx hadn't been released, which is why it was leaked.[[/note]] It, among other things, sparked friction between KC-MM and Project M members, pushing onto light an Open Vs. Closed Source debate relative to Brawl modding. [[note]]Basically, some people felt that the Project M team, which includes some of the best members and technical advances of the modding scene, has a tendency to hog the best tools to be used only for Project M. The argument against that notion is said tools are functional but not perfect enough for the team to be comfortable with distributing publicly.[[/note]]
** L-cancelling, pressing the shield button during an aerial attack to reduce the landing animation, is a hot topic of debate. Supporters say that it adds more options and makes the game require more skill to play. Detractors say that there is never any reason to ''not'' L-cancel, so it should instead be done automatically rather than require what they perceive to be an unnecessary button after every attack.
* DefaultSettingSyndrome: Since the general tournament settings are coded to be the default, this is inevitable.
* GameBreaker: In just about every version before 3.5, there was always at least one (though the first demo's meta never developed quite enough to reveal any). The most infamous include 2.0's Ike and Lucario, 2.5 Sonic, 2.6 Ivysaur, and 3.0 Mewtwo.
* FandomRivalry: There is a tense three-way rivalry between ''Melee'', ''PM'', and ''Wii U / 3DS''. ''Melee'' supporters argue that the original is the gold standard that cannot be topped with ''PM'' being only a pale imitation, ''PM'' supporters argue that their game has overall improved on Melee, and ''Wii U / 3DS'' supporters argue that their game has been dismissed as "casual" far too early.
* HilariousInHindsight: Several of the features in ''Project M'' have subsequently announced counterparts in ''VideoGame/SuperSmashBros for WiiU[=/=]3DS''.
** This game turns Jungle Japes into [[VideoGame/TheLegendOfZeldaSkywardSword Skyloft]], where players brawl on a floating stage that tours around Skyloft. Cue the reveal trailer for ''VideoGame/SuperSmashBros for WiiU[=/=]3DS'', and Skyloft is one of the stages to be revealed in the new game, with the exact same concept of a floating stage that also tours around Skyloft.
** Most of the stages in ''SuperSmashBros for WiiU[=/=]3DS'' have a "Final Destination Mode", which turns them into something similar to the tournament-friendly versions of Brawl's stages featured here.
** This game splits the Franchise/{{Pokemon}} Trainer's trio of Squirte/Ivysaur/Charizard into three separate fighters. ''SuperSmashBros for WiiU[=/=]3DS'' also splits Charizard off into a single fighter.
*** Speaking of Charizard, the Charizard in ''Wii U and 3DS'' has a claw attack for a forward air and his signature [[Anime/{{Pokemon}} Seismic Toss]] as his up air, just like the one in this game. The latter has been suspected of being a deliberate ShoutOut.
** Zero Suit Samus, though already independently accessible in ''Brawl'' via an EasterEgg[[note]]Hold the shield button during the character select screen.[[/note]], was made into a completely separate character with her own picture on the character select screen in ''Wii U and 3DS''.
** Dr. Mario and Mario were merged into one character in this mod, to the point of having Dr. Mario only be an alternate costume for Mario. In ''Super Smash Bros. for Wii U[=/=]3DS'', Dr. Mario returns as an alternative to the normal Mario meant to appeal to ''Melee'' players due to him being more popular than the normal Mario in competitive play.
** Donkey Kong's dash attack in this mod is the RollingAttack from ''VideoGame/DonkeyKongCountry''. [=SSB4=] makes this exact same change. Similarly, Sonic in ''Project M'' has the Insta-Shield as a neutral aerial, a change which [=SSB4=] similarly makes.
** Even though the wait was long, Mewtwo was finally brought back proper in SSB4 as future DLC. Time will tell if he's inspired by Project M's in any way.
* InternetBackdraft: ''Project M'' fans seethed with anger when it was announced that the primarily ''Smash''-focused tournament APEX would drop it from its 2015 lineup. It flared up some more when it was confirmed that Nintendo was indeed sponsoring APEX, leading to accusations of Nintendo attempting to strongarm the community into playing the games they way they were originally intended to be.
** FandomRivalry: When it was announced on Smashboards' news that ''VideoGame/SuperSmashFlash2'' would have a booth set up at APEX soon after, a large portion of ''PM''[='=]s fanbase [[MisBlamed accused it]] of "replacing" ''PM'', along with accusing Nintendo of having a DoubleStandard as ''[=SSF2=]'' has a notable number of third-party characters. This was, of course, a ridiculous accusation, as a booth meant to showcase is nowhere near the levels of both risk and notoriety brought by a formal tournament bracket. [[CriticalResearchFailure They also failed to notice that they had a booth for the past two years]].
* LoveItOrHateIt: Opinions on the mod range from "It's the best ''Smash'' ever made" to "It's a deviation of a good game that didn't need to be fixed." Of course, this kind of debate is to be expected since the ''Smash Bros.'' fan base is infamous for how much it argues over how the games "should" be played since they offer such a wide variety of playing options.
** ItsEasySoItSucks: One of the common complaints from detractors is that the game increases the input window for a lot of Melee's advanced mechanics to make them easier for less skilled players. Other common complaints include criticisms about the ease of recoveries on most characters, [[DefiedTrope though this was addressed 3.5]], and certain characters requiring a lower skill cap to match the output of high-skill characters (Fox and Falco, Melee's top-tier stars, are usually the baseline for this).
* MemeticMutation: 'Please secure your wrist strap to safely contain hype.'
** The number "47" appeared in several videos and counting since the April Fool's Turbo Tuesday Samus video. It's currently the big mystery of the game. It's the subject of much joking and speculation.
** "Woop woop," after the sound that Mewtwo's up-B makes. Crowds have even started chanting this in tournaments when Emukiller is ledge stalling.
* RescuedFromTheScrappyHeap: Many characters who were considered useless in either or both the Melee and Brawl meta are showing up as completely viable picks against Melee standouts like Fox and Falco. While the meta has yet to be fully fleshed out, it's already looking like the gap between high tier and low tier is much, much smaller than it was in Melee, and Brawl especially.
** Not to mention Mewtwo, who went from being the worst to one of the worst characters throughout Melee's lifetime to being one of the ''best'' characters in the game (at least before 3.5), truly fitting its status as a [[OlympusMons Legendary Pokemon]].
* ScrappyMechanic: The fact that you can no longer pick up items while running like in Brawl...to people who play with items on, anyway.
* SpiritualLicensee: At higher levels, and especially in Turbo mode, it's the best Anime/DragonballZ game ever made. Just watch [[https://www.youtube.com/watch?v=LhnrNYcw62A this]] for proof as to why.
* TheyChangedItNowItSucks:
** Inverted. Most of the tweaks to character movesets such as Ganondorf's float and Samus' Ice Beam mechanic are unanimously approved of because it makes them closer to their canon counterparts while keeping them unique.
*** [[DefiedTrope Defied]] with Ganondorf in particular. The dev team knew that his old mains would be upset about the AwesomeButImpractical Warlock Punch being removed in favor of the more useful and canon-adhering Dead Man's Volley, so an [[UpToEleven even more flashy and devastating]] Warlock Blade was added as an EasterEgg attack.
** Played straight with other characters; as stated above, the changes to Lucario and Falco's movesets are considerably more heated among their ''Brawl'' and ''Wii U / 3DS'' players, and there is still a minority who prefer Wario's Bike to the ''VideoGame/WarioLand'' Shoulder Charge that he has now.