''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.
* 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.
* 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]]
*** On the topic of Falco, there's some arguments on whether or not it was a mistake to return him to MovesetClone status from his DivergentCharacterEvolution in ''Brawl''. Some fans say his animations were fine as they were and didn't need to be turned back into a glorified alternate costume for Fox. Others cite that Falco was the [[VideoGame/StreetFighterII Ken to Fox's Ryu]], and his playstyle was different enough already to justify changing it back.[[note]]Given that there's now a publicly available Clone Engine (known as [=BrawlEx=]) by a separate party, however, it's possible to have both in one's personal game now, and easily, too -- a Falco and a "Young Falco", if you will. All one has to do is follow the directions of the engine, change a few lines of the code, and move M!Falco's files over to a separate folder.[[/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]]
* DefaultSettingSyndrome: Since the general tournament settings are coded to be the default, this is inevitable.
* GameBreaker: Mewtwo. He is a heavyweight, making him hard to take down, has very fast-moving and hard-hitting attacks, and is has a lot of mobility, but that doesn't end there. His neutral attacks have abnormally long range compared to other characters, his side B is essentially a superior version of Mario's side B, and to top it off, his Final Smash is essentially the same as Lucario's but deals more damage, is wider, and can KO virtually ''anyone'', even at 0% thanks to its very high knockback.
* FandomRivalry: With official ''Smash'', especially with the timing of ''Project M'' ver. 3.5--it was released only a few weeks before ''Smash'' for Wii U was released and about a month and a half after ''Smash'' for 3DS, so you have ''M'' fans who are apathetic of 3DS and Wii U ''Smash''.
* HilariousInHindsight: Several of the features in ''Project M'' have subsequently announced counterparts in ''VideoGame/SuperSmashBros for WiiU[=/=]3DS''.
** This game turns [[VideoGame/{{Electroplankton}} Hanenbow]] 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, just like the one in this game.
** 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 meant to be.
* 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 has been confirmed to be due for a serious overhaul in 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.
** A good example of this are the Zelda characters, who are infamous for being the more popular characters but consistently ranking low in tier lists. In Project M however, Zelda is ranked in 3rd place with Link in 7th place.
** Not to mention Mewtwo, who went from being the worst to one of the worst characters throughout Melee's lifetime to being the ''best'' character in the game, 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.