I have a 2-1/2 year old Droid X that has a plastic case/skin and it has survived a number of falls right on the face. The edge of the plastic creates a bevel around the screen so that when the phone is dropped the screen does not touch the ground. I have also used a transparent plastic screen saver to keep the screen from being scratched.
This phone is still in use by another family member. I have a new Galaxy S 3 and I noticed that it is very slick to hold. I also have a plastic case and screen saver for it.