Captain Cadaver said:
That only proves they were bland in the first place and had nothing going for them beyond a gimmick.
Bergamo was kinda sly and cunning in the anime. He seemed to convince the other universes Goku was the villain.
Lavender seemed to be vicious and sadistic.
And Basil was prideful to a fault.
Their fighting styles reflected their characters (Bergamo's ability involves him intentionally letting his enemy attack him to build up energy, Lavenda's poison fists were a cruel and sneaky way of fighting, and Basil's kicking style reflected his arrogance with him keeping his arms crossed due to how confident he was in himself).
You can call them gimmicks, but their abilities made them much more interesting, and their battles were made much more interesing as a result (people loved Basil vs Buu, and Lavenda vs Gohan was interesting for the tactics Gohan had to use to overcome Lavenda's abilities).