What just gets me is this game is so focused on realism, you're playing the game thinking...man this game's pretty damn realistic and awesome, and bam some guy is charging in with a smg just firing blind like a crazy man.
So what is unrealistic about that?
Stop and think for a moment. Why was the SMG invented in the first place? The point was to clear trenches during WW1. The SMG was specifically designed to overcome riflemen in close quarters and to do it every time, not just when a skilled soldier was carrying it.
The only thing unrealistic about SMG's in games like this is they are TOO HARD to run and gun with. Even the Tripwire guys found that out when they actually tried one, which is why they have un-nerfed SMG's for RO2.
The SMG was from the outset designed for one phase of the battle - the final assault - and it is meant to be better than ANY other weapon at that time. In every other situation, the SMG is a liability. In a trench, a room, or an alleyway, the SMG is the king of the hill by design.
If you have a rifle, you shouldn't be hiding in the places where your rifle is a liability. So in the cases you are talking about YOU are probably the one who is being unrealistic. If I have a rifle designed to kill from a mile away, the last thing I want to do is get closer than a mile, if I can help it. While that SMG guy covers that mile, I can take shot after unanswered shot at him, but if he gets within spitting distance, I am dead. That's the way it is in the real world, and it's the way it is in this game.
Realism is balanced by being properly unbalanced. By that I mean an SMG should ALWAYS be EVERYONE'S weapon of choice for CQB. If you prefer anything else, it's because you don't really know what you're doing.
The balance comes in when you realise that the SMG should be NO ONE'S weapon of choice for open field battle. If you are out in the open with an SMG, you should be scared ****less. You get to be "the man" when the rifleman is cornered in a small room, but if you're in HIS domain, you're toast.
So if you say it's "unrealistic" that an SMG can run and gun and spray and pray and all the other terms that were invented in the real world for those exact kind of actions, you have to also say that it is "unrealistic" for a rifleman to be able to shoot me in the head from 300 yards. "It's unfair, my SMG doesn't even go that far!!!!111ONE."
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It occurs to me that thinking it through logically answers all these questions.
Back in the day they had riflemen. They lined up across a field and took shots at each other. Every now and then, they would UNLOAD their rifle, and turn it into a pike (by fixing a bayonet) and they would charge each other.
Then the MG was invented, and riflemen suddenly got mowed down en mass. One MG could fire as much as a hundred men. Riflemen were nothing but targets. So they dug trenches. They got out of the way of the weapon that was superior in the open, by creating their own cover. Stalemate ensued.
Then someone said, what if we take a machine gun, but make it a lot smaller and easier to shoot, so you could even do it while running around and in trenches. Suddenly the trenches weren't safe any more.
So what was the result? The riflemen said we need a weapon that is light enough to run and gun with but powerful enough to kill at combat ranges of 300 yards or so, and the assault rifle was invented.
Where is the bolt action rifle now? It's gone. There is an obvious reason.