You really need to hear Dennis Leary's rants about coffee flavored coffee. Generally, I find that the people who really like coffee the least are those that add flavors to it. The hardcore fans are usually black or just milk.

As for flavored teas, I really don't like berry teas. If I wanted something fruity, I would have juice. To each their own though. I don't even have milk or sugar in tea. I want the tea taste.