fastfreddie saidForget the canned tuna; try roasting a piece of fresh tuna and you'll never want to eat the disgusting canned stuff again!
I remember as a kid when my father went out onto the Atlantic Ocean on his brother's fishing boat, and brought fresh tuna home he caught. And it was spectacular! Nothing like what you get in cans, I couldn't believe it was actually tuna, though I realize there are many types.
And sometimes in restaurants I will get fresh tuna that is wonderful, even essentially raw like sushi. But, such pleasures can be pricey, and there are times when canned will do, especially if it's just going into a salad or a sandwich.
Bottom line: I like tuna, I like most fish (well, truth be told, there's almost nothing I WON'T eat on a civilized menu). Eating tuna is a good & healthy thing in my opinion, and the only issue is the preparation. Go easy on the fat & cholesterol (regular mayo being a big offender), and you'll be OK.