Darkwolf71 said:Not at all. Much of the damage you describe is disabling due to pain. Take away the pain and you need to completly destroy those body structures to be effective. Damaging them isn't enough. Find that hard to believe? Research what kind of physical punishment someone can take when hopped up on PCP. I promise, you will be suprised. Take away the pain and the human body is an amazing machine.
Now, back into the fiction, take away the need for breathing and blood circulation. All of a sudden nothing short of complete destruction of bone will slow the thing down. The problem is, most ammunition is designed to do soft tissue damage. They don't do much to harder bones. Bones that are protected and to a point held together by the surrounding meat. So, you need a headshot.
Most military ammunition is not designed to do soft tissue damage or bone damage, because of the simple fact that most military ammo is designed for ballistic performance and armor penetration rather than for what it does to the tissue it hits. That being said, most military rounds from assault rifle on up will shatter bone effortlessly, and often make a mess of the surrounding soft tissue. Sure, there have been accounts of people staying functional despite 15-20 9mm or .38 caliber wounds, but rifle rounds have several times the energy. Not so many accounts of people surviving a dozen 5.56mm hits, never mind 7.62mm or .50 caliber.
Like I said, it might take a lot more shots, but a couple dozen decently aimed AR or MG rounds and anything humanoid that relies on muscle and bone for movement is going to just flop around in a ragged mess. (naturally, I'm not trying to argue that that this would more effective or efficient than a single headshot)