Huh, might as well call it Ostheer, since I know how to spell that. My problem with Assault grens is that they don't scale well and smart USF players will back away from advancing Assault Grens. Plus at 280MP and 28 to reinforce they are a big manpower drain on already a very MP draining match.
I find that Ostheer just can't lose much, compared to any other faction. I mean OKW can build and lose the Kubel Wagon in the first 5 minutes and be fine, same with Cons or a M3 for Soviets and a Riflemen for USF. I just feel the effects of losing even one unit early with Ostheer so much more than with any other faction. From my experience of testing Assault Grens, they are a throw away unit once the first Bars come out, since they can't compete (They need a Stg44 upgrade or a Armor buff at Vet 2).
Here is a replay of a victory over Soviets with Mech Assault:
Forget Assault Grens...they are horrible. Going 3-4 grens into 1 MG is your safest bet. I open with 4 Grens then Tech tier 2 to be rdy for any vehicle play.
If you dont see an early M20 gor for the MG...if you do, get a Scout Car and the cannon upgrade.
You are also right about staying grouped up. And KEEP your Grens at Farthest range when fighting Riflemen...they are more efficient there. All you have to do as Oshteer early is hold on to a fuel and munis point. Choose one side of the map and keep your grens close to each other. Also s_mines can help ...place on fuel point.
As Quentin said...get LMGs and maybe a 5th Gren (or 2nd MG, but I prefer Grens)...some Paks (I get 2)....maybe a Stug E (if you go Mechanized) ...by the time you get StugE (around 10-12min) you should start to push US back and regain larger parts of the map.