Man, as someone that has solely listened to basshead level iems, the Miracle is a bit of a chameleon. At times I swear that I need more bass impact but then at other times it seems like it has the perfect amount of bass. Actually sometimes I'm so surprised by the level of bass it puts out that it makes me think that I wouldn't even want anymore bass out of an iem. It's definitely not a basshead iem but if a song has a lot of bass, it will definitely show it.
I'm still learning the ins and outs of it but so far it's the best iem I've ever heard. I can see how people wouldn't prefer the sound signature of the Miracle but to deny that the Miracle sounds good is basically like saying that the music you're listening to doesn't sound good. The Miracle is so balanced that it doesn't really add anything that isn't originally there in the song. With that said, if the Miracles truly sound terrible to you then chances are you're listening to terrible music =)