I pigged out on sushi a couple of times when I was in Vancouver recently. It took a little doing to gag down that first taste of absolutely raw tuna and salmon, but I did it, and it was OK. And I wasn't hungry for a long time after that. I'd do it again, but if you ask me, raw salmon and tuna don't have nearly as much flavor as it does after a short trip through my BBQ. I'm not talking about adding spices, sauces, or any seasoning at all--just throwing it on the grill and waiting until it is barely cooked all the way through.
On the other hand, next time I go fishing with my brother-in-law, the first trout I pull out of the water I just may start gnawing away on it right on the spot just to gross him out.