Seriously, it is like a cow on wheels. Fat, fwd, dull. It isn't a Cadillac, at all. Buick can fill the role with it's big fwd sedan, and in a way it fits it better. But you have to be out of your mind to want an XTS, when you can get a CTS for $500 more.
Why waste production capacity and showroom space for the XTS, when you can use it for a more unique and exciting model ?