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.
YMMV: Hello Project
Americans Hate Tingle: Western fans of H!P will sometimes declare that Coconuts Musume was the worst group ever in the history of Hello! Project, whereas everyone else cares just as much about Coconuts as they do any other defunct H!P group.
Base Breaker: Coconuts Musume is this for many western H!P fans. Mika and Ayaka are usually forgiven (the first being half Japanese and the latter fully Japanese), Danielle specifically gets the most flack despite not actually being the worst at speaking Japanese.
"Funny Aneurysm" Moment: Any joke about Iida Kaori regarding Motherhood or Childbirth. Especially appearances when she was actually pregnant. Other references that aren't meant to be funny are Harsher in Hindsight.
Apprently former Morning Musume member Junjun really likes Berryz Koubou captain Shimizu Saki.
Kamei Eri: Those two have a bit of a suspicious relationship.
Memetic Mutation: The infamous Dramatic Chipmunk originated from a Hello! Morning segment featuring Mini Moni (with the "chipmunk" actually being a prairie dog).
The Scrappy: Michishige Sayumi was not well liked when she first joined Morning Musume, as her singing and dancing were decidedly sub-par and many found her narcissistic "cutest MM member" gimmick obnoxious. History would repeat itself a few years later, with the arrival of Kusumi Koharu. However, as both have grown as performers and eventually endeared themselves to a large portion of the fanbase, they can be said to have been Rescued from the Scrappy Heap; Sayumi won a lot of people over just by deliberately overplaying her Kawaiiko and It's All About Me tendencies to the point of comedy. That said, when discussing the single Resonant Blue, Sayumi lampshaded her role in the group: "I always get the 'Ah!' and 'Uh!' lines. I want to sing some actual Japanese words for a change!" Sure enough, come the single Onna ga Medatte Naze Ikenai, one of her (few) lines was an "Ah!".
Most recently, Mitsui Aika. Tsunku likes her though.
Sayashi Riho is starting to get this now as some fans are starting to accuse her of being the Spotlight-Stealing Squad.
Shipping: Seems to revolve around 4th Generation member and resident Tomboy Yoshizawa Hitomi being paired up with more girly members like Ishikawa Rika and Ogawa Makoto. Though H!P Fandom does get passionate Die for Our Ship is never invoked and even Ship-to-Ship Combat is rare.
Yoshizawa and Ogawa playing rather Les Yay-ish romantic roles in Mr. Moonlight ~Ai no BIG BAND~ certainly didn't help... Though it should be noted that Yosshi is actually playing a male in the style of the Takarazuka Revue.
Nor did Yoshizawa and Ishikawa seeming to kiss one another full on the lips in the Ongaku Gatas video for Come Together.
The Woobie: Iida Kaori and Yasuda Kei were pretty much The Chew Toy for the hosts of Utaban who actually Would Hit a Girl, especially Iida, although they never really hurt her (physically anyway), and it's always played for laughs.
Yaguchi Mari has a history of being mercilessly teased on shows like Utaban and HeyHeyHey!
Occasionally invoked for Kago Ai due to her going through a Break the Cutie.