I think it is a good evolution of their design language (that I'm not particularly fond of).
I think the ATS is the best looking of the line, but I have to say I was a bit disappointed with the quality of the ATS interior after sitting in a couple of them over the weekend at the Denver auto show. I walked out of a Lincoln MKZ directly into a ATS and was surprised how much nicer the MKZ came off. That being said, I am sure I would still get an ATS over an MKZ for the driving dynamics and looks...I just think Cadillac (and GM as a whole) has fallen behind the competition on interior quality (BMW has as well).
I do like the sound of the twin turbo 6 and would love to see that in the ATS-V...although I would like an LT1 even more...so who knows.