I only play for Soviets and HMG is my favorite early game unit. Its always up after match as most effective unit, 1500-2000% effectiveness.
I build it as fast as possible. It counters all early game infantry and MG, is effective point capture weapon, just order it to attack and it will suppress everything in its path. Longer range and faster deplay time makes it perfect for offensive purposes.
Now against flamer halftracks and MG emplacements and people in buildings and armor you need other stuff. But against infantry i want no other unit.