What are some examples of stories (from any media) you find to be otherwise good stories – be it in their world or messages or supporting characters – that have bad protagonists, either through their dullness or unoriginality? Sometimes you need the MC to be a relatively blank slate so that a reader can self-insert, but many stories don't do this while failing to give their main character any traits of notoriety or particular motivation.
I personally find the world and supporting characters in Harry Potter to be excellent, but Harry himself is rather dull. He doesn't have many discernible personality traits and even though JKR tried to edge him up a bit in Order of the Phoenix and add more layers to him, by the final book he's back in "default protag follows the whims of the plot" mode. I feel that the protagonist and their motivations/aspirations should be at the absolute centre of a story and "defeat the generic ancient evil because adults/my tragic past said to" doesn't really do it for me anymore.
On the other hand, while the gameplay is far from spectacular, I find Luke of Tales of the Abyss to be one of the most compelling protagonists ever to come from a Japanese-origin game. The story is constructed around him and his rather childish personality, and how many villains and even the other heroes use Luke's naïve but also childishly assholish nature against him. At a certain point Luke realises
At the same time the player realises that although Luke is a selfish asshole, it's because of his lack of knowledge in a world where everyone else, even the romantic female lead, is very manipulative. I think the writer(s) must have looked to classic theatre writing styles to construct this character because his flaws are the entire story. But measured up against the hypocrisy in which his society is mired, Luke ends up looking by far the lesser evil, least of all due to his innocence.
I figured this was best off in General rather than limiting it to specific things like books or TV or games. Remember: protagonist literally is derived from the Greek meaning "first actor" and refers exclusively to the "main" character.