Originally posted by Durex
Alot of people who play MW2 are unintelligent and don't realize shottys take 3-4 times the time to switch to than pistols. Mainly people with knowledge of the game and semi-skilled will use these.
Or they prefer the shotguns to the pistols
I prefer shotguns, as I prefer being able to take out large groups of enemies without reloading. As you said, the long time to switch to them is their downside.