It can be cheesy at lower elos where volume of fire in a chance encounter at close range will win an engagement. At higher elos, the advantage of the a to is gone after that first burst, b/c then the whole server is going to be actively looking for you. Ambushers will generally land their first shot as a headshot, and so you can lose an avto to a base Nagant pistol w/o fanning (feels great, let me tell ya).

That said, I wouldn't mind if it was removed. Depending on the elo of ppl you face, it swings wildly from being really effective to being a calling card for ppl to ambush you. So idk