Some tangs taste pretty good once you get past the anthropomorphic view of them you develop around this hobby. I enjoy spear fishing, and when traveling different places you “do as the Romans do.” If they are eating em, they’re on the menu.
They don’t have a very fishy taste, the only downside in my eyes is the low yield of meat. I’d describe the taste as just your average saltwater fish. Nothing special but nothing bad.
Fun fact, some surgeon fish and other reef fish (like rabbit fish) are thought to have hallucinogenic effects if you eat their heads (ichthyoallyeinotoxism). Convict tangs are one of them, but they just made some kinda sleepy.