For some, it is an acquired taste. If you spend enough time chugging Bud Light and Coors Light in high school and college, you really come to appreciate thetaste of a quality beer. I myself cannot seem to find an appreciation for dark beers. Guinness, Sierra Nevada, just about any IPA, I just don't care forthe taste. Give me any pilsner, lager, alt, (golden beer), and I'm golden! Stella, Dos Equis, Leffe, Orion, Kirin Ichiban, Asahi, Fat Tire, Fosters,Pilsner Urquell, Boston Lager, etc., I love them all. The most I'll venture into dark beers is Bohemia (best Mexican beer).
Sam Adams Chocolate Bock is good, Pliny the Elder is disgusting (to me at least). I cannot really touch most of the Stone Brewing concoctions (ArrogantBastard, Ruination Ale, etc.)
So basically I love the taste of lagers and pilsners and golden beers, and I hate the taste of ales, stouts, dark beers, etc. Not big on bitter.