Surely you meant "function over form" here? I'll assume you did, and yes I can agree that delivering mail doesn't require anything pretty. Apparently the cartoonish height came from USPS requiring that anyone as short as 5'2" can see over the hood and someone as tall as 6'8" can stand in the vehicle. Still doesn't look that great or practical (for narrow or rural routes) to me, but I guess we'll see.
Those huge windows and tiny hoods also probably make them significantly safer for little kids and pets.
USPS trucks are regularly driving through highly residential areas including fairly quiet ones where little kids may possibly be running around close to the street or even on them.
Really the only flaw is trying to mirror a conventional car headlight design; if they went with something a bit quirky like an LED grid covering the entire front or something it would become something totally unique.
It looks... bizarre, like someone gave a box truck the lowrider treatment. And is that a hint of Chevy I see at the top of the grill, although it's based on a Ford?
i also think they're ugly, but they're ugly in a disarming, endearing sort of way. and maybe it's just becuase i know it's a mail truck which is a useful thing, but i think the ugliness makes me like it.
