Obviously, Super Bowl XLVI for Cadillac is all about the ATS, possibly their most important car ever. And they don’t mess about with fancy stories. They get right to the point, telling you this car is better than BMW 3 Series, and if you don’t believe this you can go to hell. Now, before you react we have to point out they mean the Green Hell, the infamous Nurburgring! So the Americans came to the German car makers’ backyard, and developed a car that beats the best of what they have to offer. You believe this? We’ll see…