It's a safe assumption that such all you can eat sushi was of mediocre quality.

But, when it comes to the real deal. Sushi from a tier one or two Japanese sushi chef then the rice is actually the most important factor in making good sushi.

Discarding the rice would be seen as comparatively barbarian as dunking a freshly made piece of sushi by a good chef into this mixture of soya sauce and ersatz "wasabi".