The award for "Lamest Use of a Game Plot" goes to a tie between the Banjo-Kazooie series & Donkey Kong 64. Why?
A collect-a-thon means the game focuses on having the player collect things for a certain goal. Granted, you can have boss battles, but they are only here so you can collect something. Focusing on collecting alone ruins the gaming experience.
As for bad games, I have to go with games reating to either Disney & Nickelodean shows or movies (except Spiderman & Star Wars: Episode III).