I haven't been a fan of stalker since MW3. Not because I get beat by it, but simply because it changed how COD was played. Gone are the days when you need to be careful and go around corners slowly, you can just ads and walk and you're fine.
It adds an advantage to the AR's that frankly never should've been added and is magnified by the ridiculously low kill times. I was never a fan of SMG's and Im not at all a fan of stalker ar's. Why? Because you strafe way too fast in both cases. That can make a huge difference in this game especially because the kill times are so small, there is absolutely no room for error. Now yes, you need to hit all your shots, but hit detection is still far from perfect.
People complained that sleight of hand pro was op in BLOPS 1. Stalker is this games sleight of hand pro. There is absolutely no downside to it at all, and it adds an edge that an already really good weapons class should never have been given.