How do we define a "luxury" car? Build quality, craftsmanship, materials used, options and features, badge on the hood, price point?
IMO a TLX is pretty luxurious (meeting my above points) for its price. More so then a similarly priced Euro anyway.
Personally, I never cared about a "luxury" badge in my buying decision -- I focused more on my experience with the car, tech, ride, etc.
As an alternative definition of a luxury car, one could also look to the names of folks working in "forums of interpretative dance". I've met dancers named Mercedes, Lexus, Porsche, but never met a dancer named Acura
I guess it boils down to what message you want to convey...