I think you will find that the case for the majority of manga adaptations, especially if you are valuing story over sound/animation. A far more interesting question is if there are any Anime that were better story wise than the manga or LN they are based on.
The first two that I can think of for that are Kino no Tabi and Akira, both of which cut out large sections of story I felt to be completely lacklustre when reading them. Akira the movie does get a bit rushed in explanation, but you can figure it out with the movie alone if you rewatch it a few times. Kino no tabi was just really awful in the Manga or LN, even devolving into having mascot waifu characters. Nakamura is a genius for turning that awful story into a masterpiece.