The exterior look of the car is about average for an economy car. I think its a tad nicer looking than the civic and corolla. I test drove all three, and walked away with Mazda as the clear front runner. I would imagine that a Civic will typically be more reliable way down the road than the 3, but we will find out. The 3 feels sturdy (corolla did not) and it has more get-go than the civic had. I was in a car accident(vs a Trailer truck) last winter and the car appears to have recovered nicely and I'm alive to talk about it. If you are looking for an economy car, give the 3 a shot.
Interior look. Get-go (for an economy 4 banger). Safety/Sturdy (survived a big accident).
None to speak of really. Maybe a longer Warranty (though I didn't use any of mine)