Sashimi shouldn't smell. I went to the fish market in Tokyo... HUUUUUUGE (on the order of several city blocks)... dead and live fish and other seafood everywhere... and even in the middle of it, there wasn't even the faintest fishy smell. And man, the sushi/sashimi at the little shops there was goooooood..... not everything they serve was sashimi, though most was, and pretty much all had something to do with seafood. It has ruined me for life for anything inferior. *sigh*
Sushi itself is the rice - it's different from normal japanese rice in that it's got vinegar and sugar in it. The general recipe varies by region and the exact recipe by individual.
I make what friends call "sushi salad" (actually called "chirashizushi" = scattered sushi). Sushi rice + cucumber, grilled salmon, scrambled egg, sesame seed, etc., all cut very fine, and mixed together.
I'm not quite clear on the terminology, but I would call sashimi + rice = sushi (or a variation thereof). Sashimi by itself is sashimi, and very tasty. And better, because the rice doesn't fill you up so you can eat more

But you can have cooked fish + rice = sushi. Or cucumber + rice = sushi. Or any number of creative things people in this country do that the Japanese wouldn't have dreamed of (e.g., California rolls)
I've tried a lot of different raw fish, and like pretty much all of them. Not as much a fan of raw shrimp, definitely not a fan of squid, octopus. If it's not an identifiable body part, and put in front of me by a sushi chef, I'll try it. I even tried things I normally don't like when in Tokyo, and have to admit they aren't too bad when that fresh and that high quality... The thing is, most sashimi I've had in the US all has a similar texture (slightly mushy) and flavor. But when it's high quality, fresh fish, each type of fish has a unique flavor and texture (not at all mushy), and you can actually differentiate them.
Would you believe, as a kid, I wouldn't eat sushi unless it was kappa-maki (nori + sushi rice + cucumber). My mom's Japanese, and was disappointed in me
