Mercedes refers to their latest creation as an SUV and frankly, I’m not sure how to label it. But that question aside, it’s not every day you get to drive a first ever Mercedes model much less its high-performance AMG variant. Small, uniquely styled and of course fast – this is the 2015 GLA45 AMG. I don’t know about you, but I don’t think of the Mazda3 5-door as an …