How unhealthy is sushi?

I'm curious to know, just how unhealthy is sushi, really? I've heard conflicting opinions on whether it's a healthy meal option or not. Some say the raw fish is packed with nutrients, while others warn about the potential risks of consuming raw seafood. Could you provide some insight into the nutritional benefits and potential drawbacks of sushi, and perhaps offer some tips on how to enjoy it in a healthier way?