Most of the time the ass grens will avoid attacking the rifle squads and instead of harass all your unattended resource points. And if they just come around the corner, they are also able to take on your rifle squad by using sprint.
On any map which isn't close quarter which doesn't facilitate movement in cover or dead ground, against any USF player who isn't a total nUb, his usually blobbed and numerically superior rifles firing from cover will just cut down AGs as they sprint across open ground.
As for harrassing unattended resource points, I consider that invalid against any USF player with nous given the ability of USF to infantry outspam any faction including OKW. Makes about as much sense as PE trying to win a capping/decapping war vs US in COH1 1v1 auto unless and until they have booby trap point if going SE doctrine. Even then, and with CAP rate maxed by an expensive fuel upgrade in KGC, their cap rate is still only 2/3 that of US inf. OK different game, but you take on board my point?
So A. highly map dependent, and B. 'Not a good look' against USF generally. If going MAC vs USF, even more important IMV to support with HMGs and other support units definitely avoiding anything resembling AG spam.
Interesting to read of your relative dread of Stug III Ausf E's BTW. I'll take note to explore and exploit this more vs USF. Thanks.
P.S. The above IME with the caveat as self-illustrating from my previous posts, I like/am an advocate of MAC doctrine generally. My view is that MAC doesn't hold as great an advantageous or the same shock impact vs USF, especially in 1v1.