You can’t just put any band on a film and expect laughs. And chemistry and appeal. That’s what happened to “Spice World.”
The directors and creators behind it seemed to basically assume, “Hell, this band is popular, they’re a pop band, they have massive appeal with the male audience, they make catchy music, and they’re British, so they’ll be perfect equivalents to The Beatles.”
And… well… if you saw the movie, you’ll know that the logic behind that theory was slightly eschew.