Honestly I've never seen art created by a machine that didn't look fairly bland. I do think there is a very human element to art that can't be replicated, at least not yet. Maybe it never can be. People tend to think that machines will always have this sort of exponential growth, but the truth is we just haven't found the limit yet. And as far as the arts go, they're very far behind. Even if an advanced machine wrote a novel, I doubt the dialogue would be much better than the Sword of Truth series :P