Generally, I like things that are meta...it's a cheap way into my heart. (Yes, I know most of it is shallow and masturbatory--I don't care.)
Which is probably why I love the Magnetic Field's 69 Love Songs. They're not love songs, they're songs about love songs. I think this is particularly important for love songs which I'm pretty cynical about. But recently I've been trying to untangle why I tend to prefer swan songs to swoon songs. Perhaps there is something that rings very untrue about the "I'll climb any mountain" tunes, especially compared to the hurt of a good break up song.
So it's a rare song that gets pass that for me. And this may be the best example for me; it has everything I want out of a love song--sweet, not too serious, very meta.