If you built both T-1 and T-2 as soviets you are going to be way behind the tech curve when your opponent gets a PZIV before you can even build your T-3 or T-4 building. Personally if I was going to fast T-2 I wouldn't just spam PzGrens, I'd add a flamer halftrack or upgunned 222 depending on whether or not I see scout cars or lots of support weapons.
You wouldn't be behind. You just back-tech. Conscripts with PPSH and Hit the Dirt can deal with the first wave of PG's then you build the tank building get an SU-85 out then build a support building for Maxims. Or another way don't build a support building at all and spam snipers, they cost the same as PG's. 3 sniper squads backing up Conscripts with HTD is lethal.