To his defence the famas was OP when it first game out. Shot lasers. Although they quickly fixed it.
No they don't. New weapons are a side grade and you specifically mention the famas which is an absolutely terrible gun. It has some of the worst bullet spread and recoil in the game, not to mention it's iron sights, which again are the worst in the game.
There is no weapon that is outright better than any other weapon in the game. The M16a3 is proof of that. It's the first US weapon you get and it's probably one of the best assault rifles in the game, too. I haven't used the Close Quarters weapons yet but I'm fairly certain that still holds true.