This is more a question about the evolution of taste than about the chemical composition of vegetables. Why don't vegetables taste good despite being healthful?
closed as primarily opinion-based by terdon, theforestecologist♦, De Novo, kmm, David Feb 25 at 11:33
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We are evolved to survive starvation, and live to be perhaps 35. So fatty foods with lots of calories taste good to us. Our genes (and preferences) lag thousands of years behind our present environment.
Because your primary school cafeteria used to serve canned vegetables, you've hated vegetables ever since, and you haven't tasted them cooked properly yet.
To make vegetables taste good, one thing you can do is going to your local farmers market, buying whatever looks appealing to you and asking the farmer for suggestions on how to cook it.