Shotguns are NOT noob.
You have to have VERY good Eye-Hand co-ordination to use them well.
The balance of it IRL is perfect(yeah yeah I'm a murderer) =P
Anyway, back to the game..
Most of the time, you have only a one shot chance at killing them with it.
If you miss, most likely, you'll die. But, if you're lucky, the other player is noob, and your second shot will kill him =P
It also has very slow shooting, my favourite is the SPAS-12, it can shoot while reloading AND it's fire rate is higher than the other non-nx shotguns!