I just leased the 335i after driving the ATS 3.6 and the BMW TWICE back to back by myself and on the same exact route. The BMW I tested (and the one I leased) has M adaptive suspension. I simply cannot agree with the review. In Sport mode with sport shift mode on the transmission, it is absolutely no contest between the ATS and BMW. Not that the ATS is "bad". It's just not better than the BMW...not even close really. And in comfort mode, the BMW is quieter; rides better and is generally more comfortable.
My suggestion: Test drive an ATS, and post your findings.
Gone but not forgotten: 2008 BMW135i Vert
Gone but not forgotten: 2011 MB C63 AMG
Gone but not forgotten: 2011 BMW z4 3.5is
Added: 2015 Z4 3.5i