I would say meaning...at least, if by "meaning," you mean "soul." I think some composers (*coughJohnWilliamscough*) too often write music that they know will sell because of its beauty, but lacks any sort of true passion or soul behind it. It's like feeding someone nothing but chocolate icing...yeah, it tastes great, but there's nothing solid to support it, and you're just doing it to be popular and/or make money.