History YMMV / TheHeroesOfOlympus

** Hazel [[spoiler: she was forced by her possessed mother to move to Alaska and raise Alcyoneus, where she made the decision to kill herself and her mother to delay Gaea's plan. Even before she was possessed, Queen Marie was emotionally abusive, blaming Hazel for being cursed. Plus, because of her curse, she is indirectly responsible for a number of human deaths which she feels incredibly guilty for.]]

** Hazel and Piper's light eye colors and the feather in the latter's hair. Some see them as inoffensive and argue the eye colors are justified since they are arguably biracial with their divine parents being Roman gods while other see the eye colors as having racist implications about beauty standards for brown girls and the feather as stereotypical.

** Hazel and Piper's light eye colors and the feather in the latter's hair. Some see them as inoffensive while other see the eye colors as having racist implications about beauty standards for brown girls and the feather as stereotypical.

* FranchiseOriginalSin: A common criticism of this series is how [[EveryoneMustBePaired almost every main character is romantically paired]] by the end, which felt excessive and unnecessary to some readers. This was actually also present in the original series with Grover having a SatelliteLoveInterest in Juniper, as well as several side pairings such as Clarisse/Chris and Beckendorf/Selena. However, it was far less noticeable there since the main cast was much smaller, Percy was the only POV character, and romance was not really a factor in the first couple books and the main romance between Percy and Annabeth took several books to develop. Here, with such a big cast, many of whom are given POV chapters (in fact, Reyna is the only one of the 9 POV character to end the series without a love interest), and romance being a major plot point from the first book onwards with most of the main couples getting together within one book, it can be way too painfully noticeable for some readers who may find the series rife with RomanticPlotTumor and StrangledByTheRedString relationships.

** Percy and Jason's relationship among fans is a source of contention. While some like to portray them as best buds and bros others view their relationship as more akin to coworkers and not that close. While some use the evidence of people saying they have a bromine as fact of their friendship others see it as them just being polite to each other.

* {{Anvilicious}}: [[HeartIsAnAwesomePower Aphrodite kids aren't useless! Look at all the cool powers they have!!]]

* AbandonShipping: Quite a bit after the last two books. [[spoiler: Nico coming out as gay and his ShipTease with Will caused most fans to abandon the popular Nico/Rachel and Nico/Thalia pairings. (Ironically them being eternal maidens ''didn't'' deter shippers.) Leo and Calypso becoming an OfficialCouple also killed off a lot of Leo/Reyna, Leo/Piper and Leo/Thalia fans, though there are still some out there.]]

** Hazel and Piper's light eye colors and the feather in the latter's hair. Some see them as inoffensive while other see the eye colors as having [[ButNotTooBlack racist implications about beauty standards for brown girls]] and the feather as stereotypical.

* FranchiseOriginalSin: A common criticism of this series is how [[EveryoneMustBePaired almost every main character is romantically paired]] by the end, which felt excessive and unnecessary to some readers. This was actually also present in the original series with Grover having a SatelliteLoveInterest in Juniper, as well as several side pairings such as Clarisse/Chris and Beckendorf/Selena. However, it was far less noticeable there since the main cast was much smaller, Percy was the only POV character, and romance was not really a factor in the first couple books and the main romance between Percy and Annabeth took several books to develop. Here, with such a big cast, many of whom are given POV chapters (in fact, Reyna is the only one of the 9 POV character to end the series without a love interest), and romance being a major plot point from the first book onwards with most of the main couples taking one book to get together, it can be way too painfully noticeable for some readers who may find the series rife with RomanticPlotTumor and StrangledByTheRedString relationships.

* FranchiseOriginalSin: A common criticism of this series is how [[EveryoneMustBePaired almost every main character is romantically paired]] by the end, which felt excessive and unnecessary to some readers. This was actually also present in the original series with Grover having a SatelliteLoveInterest in Juniper, as well as several side pairings such as Clarisse/Chris and Beckendorf/Selena. However, it was far less noticeable there since the main cast was much smaller, Percy was the only POV character, and romance was not really a factor in the first couple books. Here, with such a big cast, many of whom are given POV chapters (in fact, Reyna is the only POV character to end the series without a love interest), and romance being a major plot point from the first book onwards, it can be way too painfully noticeable for some readers who may find it rife with RomanticPlotTumor and StrangledByTheRedString relationships.

* FranchiseOriginalSin: A common criticism of this series is how [[EveryoneMustBePaired almost every main character is romantically paired]] by the end, which felt like excessive and unnecessary to some readers. This was actually also present in the original series with Grover having a SatelliteLoveInterest in Juniper, as well as several side pairings such as Clarisse/Chris and Beckendorf/Selena. However, it was far less noticeable there since the main cast was much smaller, Percy was the only POV character, and romance was not really a factor in the first couple books. Here, with such a big cast, many of whom are given POV chapters (In fact, Reyna is the only POV character to end the series without a love interest), and romance being a major plot point from the first book onwards, it can be way too painfully noticeable for some readers who may find it rife with RomanticPlotTumor and many StrangledByTheRedString relationships.

** FunnyAneurysmMoment: In the last book, an exasperated Annabeth tells Piper that her IndyPloy to help them get into an enemy's territory was the dumbest risk she'd ever seen anyone take, and she dates a dumb risk-taker. [[spoiler: Come the next chapter he features in and Percy admits that he's been letting his reckless tendencies get the best of him because his guilt over [[ColdBloodedTorture what he did to Akhlys]] had been hounding him so much he felt he deserved the punishment he took in battle. Even if it meant his life.]] Yeah.

* FunnyAneurysmMoment: In the last book, an exasperated Annabeth tells Piper that her IndyPloy to help them get into an enemy's territory was the dumbest risk she'd ever seen anyone take, and she dates a dumb risk-taker. [[spoiler: Come the next chapter he features in and Percy admits that he's been letting his reckless tendencies get the best of him because his guilt over [[ColdBloodedTorture what he did to Akhlys]] had been hounding him so much he felt he deserved the punishment he took in battle. Even if it meant his life.]] Yeah.

* BigLippedAlligatorMoment: The karpoi scene in ''The Son of Neptune.'' "Schist!"

* AuthorsSavingThrow:
** From the previous series, no less. Nico's actions toward [[spoiler:Percy]] in ''The Battle of the Labyrinth'' seem much less like a hastily Subverted CreateYourOwnVillain subplot [[spoiler:and much more representative of his romantic feelings]] after reading ''The House of Hades''.
** ''The House of Hades'' itself, which irons out some inconsistencies in the previous books, gives the new characters some much-needed development and includes a vast number of references to the previous series.
** TheReveal that Circe's place was destroyed off-screen after ''Sea Of Monsters'', finally giving Circe some [[LaserGuidedKarma well needed punishment]] for the centuries of untold suffering she caused, especially since she was believed to be a KarmaHoudini before that.