A shotgun is a weapon designed for the purposes of blowing something to pieces, usually so that you can stare at those pieces afterwards and feel badass about the fact that you pulled a trigger and turned something that was once living into a pile of mush. And though the usual reaction to picking up a shotgun in a video game is "Yeah, sweet," you've got to admit that the range on this type of weapon is generally rather restricting.
Contrary to popular belief, though, developers aren't purposely trying to limit how much fun you're having by ensuring that you have to be practically kissing a grunt on the nose to dispatch him with a shotgun: games have just turned the shotgun into a close-up killing machine because... well, that's it. It makes things varied. My research tells me, however, that your average shotgun (if there is such a thing) will prove effective at around 25 metres. That seems fair. What do you think developers? Think you could give us a 25 metre range shotgun next time around? Developers? Hello?