Assault Grenadiers are perfectly fine. They only excel at very close range. Most people will use sprint to close the gap. If I'm not mistaken, sprint is not free (??). As USF get an AA HT to shut them down or any sort of vehicle as any faction really. Always try to be behind cover vs them because they absolutely positively need to be close to deal damage. And if they are constantly using nades and sprint, you know they will have no munitions for infantry upgrades or abilities.
This is not accurate.
For starters LV's like AA halftrack and T70 come out after the critical phase that I'm talking about. Also this is mostly an issue for Soviet players, since rifleman can deal a lot more damage up close.
As I said, green cover helps very little since they can sprint up to it without losing a single model.
Again, if you made it to spawn your LV with acceptable map control (and little bleed assuming you retreated before they got a chance to strike up close) then you're already well past the issue and most likely even have the upper hand now. I was very clear that this is an early EARLY game issue.