Shotgun range isn't the issue. Shit guns don't need a nerf. What needs to change is we need more variables to counter up close shotgunners. Also map design plays a big part, there are very few maps that have long or medium open lanes to take down enemies and you can close a gap in Destiny mighty freaking fast. We can't just keep nerfing and watering down everything. We need to balance it.

Well, map size, movement, and armor we need shotguns to have very little range or else they'd be so overpowered it literally wouldn't be funny

Yes. Because only in video games can you have a shotgun that tickles at 15 feet.