These units were handed to me personally during High End in Munich. It is the way they sound, that is all I can say. I'm listening to both units at this very moment and I couldn't possibly say the Red is brighter and quicker. It does have more detail though, I don't think I said Red had less detail, it is richer sounding. Red's bass isn't harder hitting, it is bigger in body but with better detail and layering. Black's bass seems tighter, punchier and faster.
It's perfectly fine you don't find it a good review, different people have different tastes. I haven't read any other reviews of these units myself and I'm sure AQ will react if they don't agree (but hey have read it already). Did you yourself hear both DF's side by side?