I like when game has romance with slight erotic in it. It helps to make our protagonists more deep, not just some heroes that want to save the world, but persons with complex psychology and intense emotions. And sad-endings... well it doesn't need to be sad end, but I like when game story is shocking and unpredictable, and that is mostly done in negative rather than positive way. Dark and serious, but in the other hand needs to have it's comic moments. Easter-eggs are fine with me too.