The Mazda5 is alone in the small-minivan segment, and its closest competitors are likely four-door hatchbacks — including the Mazda3 — rather than traditional minivans like the Dodge Grand Caravan, Honda Odyssey and Toyota Sienna. That said, the Mazda5 manages to offer surprising utility in a package that's not as mundane as many small cars, and that will appeal to some shoppers.