I think the biggest problem people have is that in close quarters as soon as they lock eyes with a shotgun wielding opponent they are almost always screwed, skill regardless. Never mind the actual lack of foresight that got them in that situation, the moment of helplessness is enough to make a lasting impact, and provokes a 'violent' to someone who builds so much of them self on their ability to play the game.

I'm all for custom rules people use to make the game more fun. If you find a game more fun w/o a certain weapon included, and can find others who also like to play that way, more power to you. Just don't assume that the skill set that you like the game to be based around is the only one of value.