In theoretical terms it means no Axis infantry can get close without getting suppressed and killed for the duration of the firefight.
That said, who would come off better from DP armed Strelky against MG42 armed Grenadiers (only with one MG though, considering the munitions cost).Granted, the Strelky have larger numbers and can stand ground, while Grenadiers have grenades to counter them... But in an open fight, which lays down more damage?