First of all, this is a question not a complaint, well, sort of anyway.
Now, I am plenty familiar with the deathmatch scenarios, weapons etc... My issue is this, when I am shooting at someone, they never die. I'm lucky to get 3 kills in deathmatch. Depending on the map, it may work fine.
First of all, I was told "head shots". Ok, I do that, as a matter of fact, on one map, I was right behind a player and riddled the back of his head with the oozy, he did not die, instead I shot him until he simply fell off the platform and died basically pushing him from the shots. This is not the only occurrence and it happens with all weapons like shotgun, etc... yet when I am hit by most any weapon, regardless of skill of player, I am normally killed near instantly, leaving me to think ... wth?
I tested this tonight on quite a few matches and the one map that doesn't seem to be so bad is dead simple or "i forget the name of the other" dark something or whatever. I am not a great player yet but I know I'm good enough to use these weapons effectively, "except the sword"

So, instead of scratching my head in game constantly, if anyone has an idea as to WHY this is happening "and no, it's not my aim thank you", albeit not perfect and I do miss a lot, when someone is standing still and I still can't kill them while unloading 3 rounds of weapons, obviously hitting them, something is wrong.
Just looking for suggestions is all, maybe it's something I'm overlooking.
Thank You