Sure, your car's airbags will help protect you when you get in an accident, but what about that poor family of hobos you ran into while trying to pick that last Dorito up off the passenger side floor? Where are their airbags?
On the outside of the car, if you happen to have Autoliv Airbags equipped, which you almost certainly don't. When installed, these guys will inflate over the hood and some of the windshield when a front impact is detected, saving the day of the distracted cyclist who cut in front of you but also becoming a real pain when you get in a little fender bender. Worth it? I guess that depends on if you're inside or outside the car.