IMHO a pistol grip 12" -14" shotgun is almost worthless, hell ANY pistol grip shotgun is almost worthless in MOST scenerios... you have low capacity, poor ability to aim it, a good chance of getting smacked in the face if you DO try to aim it, and its not even a very good club.
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now the same shotgun with decent sights, and a stock... that's a totally different animal, and is very useful. I would not feel under gunned with a 14" sbs shotgun. especially if I had slugs and buckshot. something like this. its not a assault rifle, or a high capacity handgun, but its definitely not worthless. a single good hit with a load of buckshot gives 9-15 , 9mm sized holes in something. a good hit with a slug is priceless, and a slug will beat ANY handgun round in power and penetration. plus shotgun ammo is not hard to find, vs many handgun rounds. not to mention, even a sbs is still good at shooting animals.