Hmmm... unfortunately the RS6 still does nothing for me at all.

From the frontal 3/4 view, the front wheel arches haven't been executed all that well. It looks very Subaru WRX-ish, especially because the flaring abruptly ends at the forward edge of the front door.
The rear diffusor doesn't fit in well with the smooth surfaces and curves of the rest of the car. Also, the whole 'let's just add a black plastic rear diffusor and have some tail pipes sticking out from the edges' look is outdated now. I have the same criticism for the latest-generation AMG vehicles, but then again AMG isn't overly imaginative in design.
Finally, I can't say enough about how horribly boring the front of the A6/RS6 is. IMO, simply adding a very oversized smiley-face air-intake does not make the car aggressive, it actually makes the entire front end out of proportion. An Audi S5 style air-intake would have made more sense because it would give off a 'grrrrr!!' expression of aggression.

The previous RS6 was nicely done yet different to the E39 M5 and the E55. For me, this new RS6 is dull and unimaginative.