To be fair, shotgun use is more my play style. I think a lot of people undervalue how important someone using the assault rifle is in L4D. It slows down the Tank A LOT, giving the shotgun toters more time to reload and lay waste.
I prefer shotgun in T1, but I find the AR suits me better once I hit T2.
Or the pistol. It must be overpowered because brizz and hal have the most kills with it for T1 weapons.
I'll take the bait....
Pistol has infinite ammo and is fairly accurate if you crouch and aren't firing rapidly. So if you're playing it slow or trying to conserve ammo that's your best bet.
EDIT: I really need to get into a game or two with you guys. I've been playing with other people and I need a break from the chaos with them.