Brutes really aren't that hard to deal with... That is if your team wants to deal with them. If you have two guys emptying clips into a brute's head -- they'll go down pretty quickly. Not to mention you can call your own. I actually prefer using the sniper.
Edit: Have I mentioned how terrible the shotgun is? Because it's downright garbage and there's no reason it should cost more than the AK.
Edit: Have I mentioned how terrible the shotgun is? Because it's downright garbage and there's no reason it should cost more than the AK.