Nah. Try Riot with Trigger Discipline. You can use it at mid-range there (or even long at times). Not to mention Dinner Bell which can be sniped with like a Revolver. Shotgun spread is so big it actually matters quite a lot when you take Fast Shot for them compared to Trigger Discipline. There is 40% difference in shotgun spread between those two! Big Boomer has spread 4 with Trigger Discipline and almost 8 with Fast Shot.

Also, Fast Shot accuracy penalties can never be fully removed, even at sneak-sniping you will often miss via bigger spread despite having crosshair right on the target (never happens with Trigged Discipline). Mid-range you will be missing 1 out of 10 shots, especially in VATS and even up close you sometimes screw up an easy one. Meaning it's not as fast as theory paints it - you might get 2 extra shots per each 10 fired, but one or two of those shots you will most likely miss wasting ammo, AP and letting enemy get closer.

Multiplas with Trigger Discipline takes two less shots to drop the Deathclaw Daddy than with Fast Shot. Have 100 skill, it doesn't matter, you still are going to mess up some easy shots on regular basis.
Of course you can still use shotguns as semi-melee weapons but that kind of defeats their purpose which is crowd control (hence the name of Riot...).
On the other hand, all that can be applied in reverse to SMGs and machine guns. More spread doesn't matter at all there and more bullets per second increases DPS considerably allowing to spit out far more damage than with Trigger Discipline.
Question is what you prefer to use on crowds... Automatic fire or aimed shotgun fire.