I think some of you have a deluded view on Sam's job. He doesn't just log on and say
"Gee, today I think I'm gonna make this gun slower!"
His job is making guns fair for their price. If he gets enough complaints regarding a weapon, he will balance it. And even then you have to take into account the difficulty of even miniscule changes to weapons.
Honestly he does a pretty good job at what he does, and if it was as easy as you all make it sound, then all the guns would be balanced, and this thread wouldn't exist in the first place.