Point shooting. Shooting from the hip. Unsighted fire. Yes, it can be a viable self-defense shooting skill, but it must be practiced. Remember to index your shooting arm on the side of your body to help keep your firearm on target. Then, it is a matter of practice. Adjust your pace to have success, then work to improve from there.
From the Hip
This is not Hollywood (and cowboys shooting from the hip were never that good). Practice this and use it only for close quarters fighting. Remember, you are responsible for every round you fire. You must hit your target.