I didn't find Tokyo Marina dirty; I've been there a few times but don't think I'll be going out of my way especially to go there. For me, it falls below the value vs price curve. Not that it's expensive, I just don't think it's worth it. A cheap sushi place should have a wider variety available, otherwise I could just go to Dirk's or Issacson & Stein and buy my own cuts and make my own sashimi. For this, Dirk's is especially friendly to carry $1 wasabi powder plastic containers, and takes the skin off the salmon for you. For a good make-your-own spicy tuna, I like my friend Cheryl Smith's recipe:
2 cups sushi grade tuna, diced small
3 T curry oil (1/2 cup curry powder heated w/ 2 cups canola oil until oil is bubbling, whisk, cool, strain)
1-2 T chili sauce
6 scallions, chopped, white parts only
2 T cilantro, chopped
salt, pepper to taste
mix in a bowl over ice, add more curry oil, salt, pepper to taste