I find it funny how they balance guns in these shooter games. In real life the M14 is a top notch gun.
Yeah, in real life its performance is very similar to the G3, given the choice between the two, i would pick the G3 only because its a bit lighter than the M14, nothing else.
And its the same bloody gun as the M21, sure the M21 is slightly more accurate because it has a hand picked barrel, but they should hit with identical force.
But the CoD series have never been simulators, they just aim for "real enough" to give people the feeling that they are playing as a soldier, nothing more, and balance is definately something they value higher than realism (though i am unsure why they felt the M14 had to be worse than the G3, considdering their near identical specs, its not like it has a bigger magazine or anything else like that).