Most of what I like is objectively terrible, but I don't care. Any fun I get out of life is in all the awful I love. I feel bad for people too cool to like anything.
But ABBA is awesome. I honestly have yet to meet anyone who seriously hates them. In fact, most people I talk to on the interwebs love ABBA.
My guilty pleasure for music is t.A.T.u.. They are the best for yuri pairing videos on YouTube. It's just a fact.
For movies....I guess most The Matrix sequels. Everybody hates them but I enjoyed them just fine.
For more obscure films, I love Carnosaur.