On its first attempt, Acura hit the bulls eye of the upscale crossover market with the fairly boxy, three-row MDX. Infiniti, on the other hand, opted for firmly suspended, relatively cramped two-row eggs that have been enjoyed by driving enthusiasts but ignored by nearly everyone else. Lesson learned, a dozen years behind the leader Infiniti finally has a three-row car-based crossover. Should Acura be worried?