* AssPull: The writers were very forthright that the last four episodes of the season (drawing many seemingly insignificant plot threads together) were rewritten in response to [[FanDumb fan whining]]. Though the precise mechanics of Lothor's EvilPlan do fall close to a GambitRoulette of the highest order, the little details don't work and it's clearly a retcon. (Most of) The fans don't seem to care, making this a fine example of AuthorsSavingThrow.
* BaseBreakingCharacter: Lothor. People seem divided on whether he was a MagnificentBastard in his own right with an awesome EvilPlan (and making use of a [[XanatosGambit plan with an obvious and hidden goal]]) at the end of the series making him one of the most memorable villains in the show's history, or a complete [[IneffectualSympatheticVillain joke]] who did nothing but [[OrcusOnHisThrone sit around and complain most of the series]] and his plan towards the end was nonsensical and [[AssPull came out of nowhere]]. There's also a third faction, that loves him for his personality, plan and fighting skills, but dislike him for not getting out and fighting much.
* BrokenBase: The humor. While there are viewers who enjoy the season didn't take itself seriously as the two that preceded it, other viewers felt it was too jokey and the attempts at humor didn't work. This is rather ironic considering the previous ninja based Sentai series was much more comedic oriented.
* CrossoverShip: While not a romantic ship ([[HoYay mostly]]), Dustin and Chip from [[Series/PowerRangersMysticForce Mystic Force]] are commonly written together as good friends due to their nerdy nature (as well as being the only two male Yellows in the franchise thanks to Power Rangers gender swapping Male Yellow Rangers from ''MMPR'' through ''Wild Force''.
** Actually, there's also Tideus of the Mighty Morphin' Alien Rangers, but most people don't even know he exists.
* EarWorm: [[http://www.youtube.com/watch?v=qKfnCvGACS8 The Theme song]].
* EvilIsSexy: Kapri and Marah (If they're even competent enough to be considered evil).
* HilariousInHindsight: One episode has Marah dreaming of being a ranger herself, complete with a shot of her in a pink version of Tori's suit. [[Series/ShurikenSentaiNinninger A pink ninja-themed ranger? Give it about 12 years.]] Of course, [[Series/PowerRangersNinjaSteel give it an additional two years and you don't need to leave ''Power Rangers'']].
** A [[Series/PowerRangersSamurai samurai ranger]] who can become a [[Series/PowerRangersSuperSamurai Super Samurai]]? ItWillNeverCatchOn.
*** He also isn't the last ''Green'' Samurai Ranger with a Super Samurai Mode.
** The proposal for ''Hexagon'' would've included a dark yellow member of the Thunder rangers, but as said proposal was scrapped, the idea wasn't used. Toei apparently thought it was a good idea, since when the Gouraigers (the sentai counterparts to the Thunder rangers) appeared in ''Series/HikoninSentaiAkibaranger'', they were accompanied by a CanonImmigrant third member, [=TentoRaiger=], whose color was, you guessed it, dark yellow.
* GrowingTheBeard: Usually considered to either be when the Thunder Rangers joined the team or "The Samurai's Journey" three-parter.
* InformedWrongness: Dustin in "Tongue and Cheek". He does develop some AcquiredSituationalNarcissism, but he gets chewed out well-before then (which could explain why he would let the fame go to his head). And the one character really letting him have it is Shane, who later admits he was being jealous.
%%* MagnificentBastard: Lothor.
* RetroactiveRecognition: [[Series/PowerRangersRPM Colonel Truman]] sent Lothor into space!
* SuspiciouslySimilarSong: As [[WebVideo/AtopTheFourthWall Linkara]] pointed out, the theme song sounds a bit like "Help Me, Rhonda" by Music/TheBeachBoys.
%%* VillainDecay: Lothor. He suffers it BEFORE the series even begins.
* VindicatedByHistory: Inverted like [[Series/PowerRangersLostGalaxy Lost Galaxy]]. It was considered a fan favorite when it first aired but has lost a few ranks due to having [[Series/PowerRangersDinoThunder better]] [[Series/PowerRangersRPM received]] [[Series/PowerRangersSPD seasons]] since. However, some fans do adore this season for various reasons (The tone, Lothor's plan, the designs, the Rangers themselves...), and many appreciate the LighterAndSofter approach after the drama heavy Wild Force.
** Although as of recent, this seems to have been played straight, if the JustForFun/PowerRangersMarathonStream is anything to go by, since the only season that was as anticipated as ''Ninja Storm'' was ''Dino Thunder'' - yes, you read that right; this season was more anticipated than ''Series/PowerRangersRPM'' or ''Series/PowerRangersInSpace''. The fact that [[Series/PowerRangersNinjaSteel the next ninja-themed season]] is currently seen as SoOkayItsAverage overall helps this one.