They already require multiple upgrades to unleash their full potential.
Currently sturms wreck them and only cost 20 MP more and grens snipe them while you are charging. They are only strong at flanking and when grouped.
Accuracy and ROF nerfs make no sense.
Early game rifles aren't really meant to charge unless there's Grens in the open or your flanking
Any case a Rifle dps nerf early game means the USF could actually get variety in T0, buffed REs, a .30 cal LMG team, anything.
And on requiring upgrades for full potential: most games where USF wins they swamp Axis early, meaning Bars and Zooks are never really needed because they take the map with Riflemen+captain and a light vehicle. It's pretty much to counter heavy Volks/fusilier builds/and allow infantry to blow up buildings and deter lights to some mediums
And yeah, really I'm just bored as hell with the Amis as a faction