The only reason the shotgun is so easy is because the other guns are incorrectly modeled.
The shotgun has a faster "reaction" (I tested it and I have better reaction with the shotgun than with the BAR or Tommy)
Also if I shot any one of you with a real Tommy Gun at close range, even if you were wearing a kevlar vest, you would be flat on your ass from one shot, period! It's a .45 cal weapon, it don't take 4-5 shots to kill someone.
The BAR is also too weak and random, and takes a hell of a long time to swing around.

One time I was playing Stalingrad, I got sick of everything and started using a shotgun. I got the same score in 3 minutes that it took me 12 minutes to get with normal weapons.

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