[MMM]

I am guessing the sushi you are eating isn't very good.

Wasabi is a mustard, like horse radish, and the spiciness is felt more in the nasal passages than the tongue. Chili based spices are felt on the tongue, and to be direct, don't belong in the same building as sushi.

It is as if you are taking diamonds and attaching them to plastic rings. It's a waste.

And I don't know anyone that likes "plain sushi". A slight dab (not a soaking) of soy sauce and wasabi makes it a complete experience.