Sushi is the best food on this planet and a better argument for a benevolent Creator than anything Kirk Cameron has ever come up with:
Dawkins: There is no rational way that a person could believe--
Cameron: Here, eat this lightly-seared toro salmon garnished lemon and crushed sea salt.
Dawkins: *chew chew* ...HALLELUJAH!
Anyways, sushi without wasabi is like, I dunno, french fries without ketchup, or pizza without cheese. YOU CAN'T TAKE IT OUT. They did in the U.S., sure, cause it's a bunch of Godless heathens who get scared if any part of their famires dinner hasn't been charred to the consistency of used tire, but in JAPAN--the country where sushi CAME FROM--the sushi chefs put the wasabi directly into the sushi, not as a separate garnish, because they're not all huge crybaby pussies like here in this thread.
It's possible you've only had shitty wasabi, if you're eating buffet and supermarket stuff. Like horseradish, sauerkraut, and other potent potables, wasabi is best served fresh or not at all. But to get rid of it entirely? FUCK YOU.