SMR just feels right when you're shooting it. The firing sound is amazing, and it feels like you're really punching a crater in the enemy's chest each bullet.
Stats don't lie though, the FAL is just better. Doesn't feel as good when you hit someone though.
I think the FAL is a pretty outstanding weapon in it's own right as well. But you are right, it has sort of a wimpy feel to it, especially with the Suppressor.
I like that the Semi-Autos in this game are usable. Never been my strong point, I like that the quest for Diamond Camos is taking me out of my comfort zone a bit.