I think it does, but not for the reason TC seems to.
My aim has improved with all weapons since I started playing with the FAL. I don't 'spray and pray' as much, though I didn't do it a lot to begin with. I find myself doing better, even with weapons I normally don't like, after playing with the FAL for a while. It has become my 'go to' trick when I hit a wall trying to gold something. I take a break, run the FAL for a few games, then go back to the first weapon and do better with it.
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The FAL and SMR are fun to use in hardcore for the guaranteed 1 shot kills, but it makes more sense to have a full auto or even burst weapon for the times you're missing shots. I personally find the AN-94 to be absolutely devastating in hardcore (as good as it is in core). Even with a suppressor I rarely engage enemies at a range that requires two shots, and even if I do it gets the job done.
it doesnt make you a better player. 1 match doesnt make a difference. as long as you suck, you will suck. and then there are days when you just cant win.
its like a faster Sniper. lots of power but only shoots so much depending on your trigger finger. it doesnt feel fluid either. you move like straight lines instead of twirling around freely with a full auto.