Each time I'm presented with 2 enemies that are stacked (one is directly in front of the other), I can kill the first one, but the 2nd kills me. In CODs past, the bullets I used for enemy 1 would penetrate and kill enemy 2 as well. This has happened enough times for me to post about it, so it's pretty frequent.
Is this simply a lag issue? Anyone else seeing this? Or is this just a change in game mechanic?
I don't know if the bullets go through them or not. Either way I think it's lag. Right now I'm getting normal games about half the time. In those games I can kill multiple enemies. If I'm lagging then just forget about it. I'll die from the second guy in this scenario, or someone else, before I even hear their gunfire. Just instantly die. If i'm not lagging I actually have time to react to someone shooting, or kill the second guy in the scenario you described.