I like flavored beers when they taste good and don't when they don't. I've had good pumpkin ales, good chocolate, coffee, and chicory stouts, and that banana bread brew. Haven't had much luck with fruity ones, though I did once have a gooseberry beer that was pretty good, and I'm not just saying that because "gooseberry" is such a fun word. (Also, Dogfish Head makes something called "Raisin d'Etre" which is raisiny and good, but it costs over $10 for a 12-oz. bottle.)
Flavored coffees, however--gaaaahhhhh.