It's only good against support weapons and Grens with LMG upgrade. Keep your squads mobile and it should be ok. Or get yourself a mortar half truck.
Quick scout car ride will do the trick as well.
Also don't blob your units. I've seen this many times, especially in team games. Cluster of PG walks straight into maxim, get suppressed and then bombarded by 120mm Mortar. I love 3v3, 4v4 German players
HMG are absolutely fine as they are right now.