Sushi absolutely sucks.
Being an Asian and having gone to Japan 5 times I can confidently say that sushi sucks. I went to a Michelin star restaurant in Japan that specialises in sushi. It was mediocre.
Sushi just lacks flavour. It's basically just fish and sour rice in between seaweed. It needs some flavour. Some things in life are simple and delicious but some things are not like that such as sushi. Japanese foods like ramen and tonkatsu are better.