I like sushi and sashimi from a good place. Easy to find in Little Tokyo, LA, hard to find in a place like Albuquerque. There was an ok spot (not perfect, by any means) but it had a kitchen fire and burnt down.
Only thing I've not liked in a good restaurant was raw sea urchin. Once - became the last time. I don't like raw quail eggs as an additive to a concoction, but I don't like raw eggs period.
Would't buy gas station sushi. I've never been in a restaurant that had Fugu.. I'd be doubtful. Maybe if I ever got to Tokyo's best.
edit, yes to wasabi and ginger.
Favorite? I remember the yellowtail in the first Japanese restaurant I/we had ever been to. I loved it, but four decades later I can't describe the exact plate.