You just got done screaming at the top of your lungs that (YOUR words): "In short: THERE IS NO BALANCE PROBLEM!!"
So, what happened? You are one walking contradiction with a fully articulated jaw at each side of your mouth. Unreal. I'M on ignore??? Whatever, man, but YOU are definately on MY ignore list.
Is English your first language? He is clearly saying there is not a problem with the weapons, but with the people trying to use them.
He isn't changing his argument, you are simply not understanding it, or are ignoring it. The weapons are fine. The problem is everyone wants to use them, even the guys complaining about them.
In fact I see more people using them and complaining, than people not using them and complaining. I had one server where a guy was running around spamming it up and raging in the chat about how over powered it was. He was the only person using it. Stop frigging using it, FFS!
It is my experience that the people who are good at this game try the MkB, figure out it sucks, then don't try it again. They can do everything that gun can do, better, with another weapon. The people that keep using it are the ones who keep complaining about it, and are only using it to "prove their point".