These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Broken Base: Was the series better before or after Uprising was released? This debate mostly started when people started accusing Masahiro Sakurai of putting too much Kid Icarus content in the fourth Smash Bros..
Eggplant Wizards, probably the most iconic enemy in the series, with one serving as Kid Icarus's Arch-Enemy in Captain N. They not only returned for Uprising but received an even quirkier successor, the Tempura Wizards.
Palutena was a textbook example between the releases of Brawl and Uprising. While she only played a very minor role in Brawl, her new design was popular enough that she got a pretty healthy amount of fanart and cosplay even before her first voiced appearance in the latter - though she hadn't quite caught up to Pit himself until the fourth Smash game, at which point she had become a much more prominent character.
Fandom Rivalry: With its own sister series Metroid, oddly enough. First for Metroid 1 and its sequel overshadowing Kid Icarus and its own sequel. Then for accusations of Sakurai heavily favoring Kid Icarus content over Metroid content in the fourth Super Smash Bros., making former non-combatant Palutena playable and giving Dark Pit (a Palette Swap) his own character slot, while not adding any Metroid newcomers such as fan-favorite villains Ridley or Dark Samusnote herself more different from her template than Dark Pit.
First Installment Wins: Played straight and averted. Many people, when discussing the long amount of time since this series had a sequel, forget that there was already a sequel to the first game. However, Pit is more well-known from his Brawl appearance than in his home series, with Uprising also benefiting by following directly from Brawl and being more widely recognized/discussed than the original two games.
Memetic Sex Goddess: Palutena, not only due to her redesign, but also due to the utterly lovable personality she was given in Uprising and her various fanservice scenes in its spin-off anime shorts and the fourth Smash game.
My Real Daddy: While Masahiro Sakurai had no involvement with the first two games, he was responsible for the series' revival in Smash Bros. and Uprising and its resulting popularity boost, as well as giving the series' classic characters their current quirky, lovable personalities. Fans tend to associate him with the Kid Icarus franchise more than anyone else.
Sequel Displacement: The Kid Icarus series wasn't well-known before Brawl, but Sakurai's revival of the franchise helped propel it into the greater consciousness. The characters' redesigns are more widely-recognized and well-liked than their original designs.
Cult Classic: The first two games, while not very well-known until Smash Bros. Brawl, have a small but devoted following. A few fans strongly prefer the original games, and resent the direction the series went in after Sakurai revived it; fittingly, the fan-made Project M features Pit's classic looks (his cartoonish retro design with more adult-like proportions) as an alternate costume.
Polished Port: The 3D ClassicsVirtual Console version of the original, which adds some backgrounds to the levels, difficulty modes to make the game easier to newcomers while preserving the difficulty in the harder ones, and the option to switch between the old, NES controls and a new control scheme that makes things easier.