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.
The Stage Clear Credits is quite a beautiful tune tune. It is just called "Special Ending 4", but it is quite heartwarming as well. It also has the background set randomly.
The ending of the Game Boy version of Tetris Attack. A most emotional/heartwarming chiptunes, especially everything after 2:00.
The more calm, beautiful example of this is the SNES Version: whether it's a young fairy girl or a cute dino dragon running on a rainbow, it really sets up your mood. Especially after the clearing the hard mode.
Broken Base: Planet Puzzle League for the DS allows you to use the stylus instead of traditional controls. You can guess how this turned out with fans, especially purists.
Most Annoying Sound: Anyone's chain or combo quote in Pokemon Puzzle League can be this. Especially Persian's yowl.
Narm: While most of the characters in Pokémon Puzzle League were true to their anime personalities, Mewtwo was pretty ridiculous how he was voiced. He sounded annoyed when he was "going to winnnnnnn".
That One Boss: Butch and Cassidy in the Spa Service mode. Their level scrolls at 45, they have the rare diamond blocks to throw off basic combos and chains, and they have a very large health meter. They're even harder than Giovanni, the final boss, as while his stage features are mostly the same, his is in a 3D scrolling area that makes it easier to rack up combos and stop the scrolling. Butch and Cassidy's isn't. To make matters worse, you only get one shot to beat them; the only way to fight them more than once is to quit in the middle of the level or restart the mode.
They Changed It, Now It Sucks: Many fans' reaction to the fairies nearly disappearing from the series. Planet Puzzle League is a sore point particularly among Japanese fans as it has no characters whatsoever, leading to accusations of the game being soulless.