* BrokenBase: While many people enjoyed the game as a nostalgic throwback to the NES Mega Man games, some people believed the game had some... [[FakeDifficulty questionable]] design decisions.
* CaptainObviousReveal: Don't act like you were surprised when it turns out Wily was behind everything. Especially if you read the achievements list.
* EnsembleDarkhorse: '''Splash Woman.''' Mainly due to her being the only female Robot Master.
** Jewel Man, Galaxy Man and Tornado Man are also surprisingly popular.
--> [[OverlyLongGag "And this time! And this time! And this time!"]]
* GameBreaker: The Jewel Satellite, possibly the best shield weapon in the series. To explain, it stays up until dismissed or collides into a strong enemy. And it ''reflects shots back'', making Sniper Joes (who have MoreDakka now) a joke.
* ItsHardSoItSucks: Combined with the two above examples, some believe that the game's levels are too difficult for their own good, once again believing that the game is trying too hard to emulate its [[VideoGame/MegaMan2 predecessor]]. From the levels not being designed with the lack of Mega Man's abilities in mind, to the over-saturation of SpikesOfDoom, to bad enemy placement in some levels, not everyone welcomed this game with open arms. The fact that the game lacks a difficulty select certainly doesn't help. Though [[VideoGame/MegaMan10 the sequel]] [[AuthorsSavingThrow did]].
**The problem was that it was no longer 1986. It was Two Thousand Fucking Eight, around two whole decades after the 'glory days' of the early NES games. What might have flyed around twenty years prior didn't go over so well in an age where gamers expect their games to be, well, fair. And the early Megaman games, as good as they were for back then, were most certainly not that. Not always anyway.
* ItsTheSameSoItSucks: Some people thought that the game tried too hard to be like Mega Man 2, from using the same music in numerous places, to Mega Man losing his charge shot and slide.
** Again, it was 2008. The series had progressed and moved on, giving Mega Man new abilities, sprucing up the graphics and audio quality, and offering more fair game design in general. And to so dial things back as if the series had never had any installments past Mega Man 2 only served to pander to the old-school fans who grew up on the early games and [[BrokenBase polarize the fanbase.]] If there's any real reason why we only had one more sequel after 9, this might have been it.
* MemeticMutation: The internet didn't wait with smearing RuleThirtyFour all over Splash Woman when she was announced.
* TheyChangedItNowItSucks: Mega Man's loss of his Charge Shot and Slide and their transfer to Proto Man. Many find that it makes his playstyle feel backwards and blander than it once was.