I think it's a good thing. At least for wehrmacht, which can't fight riflemen or infantry sections with grenadiers at all during the early game. The quick MG is a must.
IS to me aren't an issue. Early game you will see 2 normally with them going a vickers and rushing tier 1 for early engi or AEC (A different issue). The rifleman horde is tough and I agree the Ostheer need something to assist. I don't think it needed to be addressed by giving the MG42 in T0 though. Would of loved to of seen a different approach.