I don't think they're an issue as OKW, sturmpios deal with them just fine if the AssEngies have to run up to you and they're not exactly cheap to reinforce. But starting with 3 assengies against ostheer on a map that isn't langres or crossing is stupidly powerful because grens and pios don't do anything to the engies (you need two grens far away from each other to force off one assengie squad) and the only way MG42s will be effective is if you guess exactly where your opponent is going to be for the first few engagements. Map control ends up being even worse than against rifles and then you get the usual lieutenant light vehicle rush to seal the deal.
Hey you are supposed to be allies biased no matter what! My whole world beliefs are falling apart