The German MG42 was far and away the best LMG of the war.
The MG-42 and the MG-34 before it were not LMG.
Not even used that way by the Germans doctrinally, either.
They are GPMGs, the US parallel was the M-1919, not the BAR.
The comparisons get wobbly as the German Abteilung is a Maniple rather than a Platoon. German doctrine made a maniple based on two GPMG with the rest of the riflemen in support of the MGs.
US doctrine split infantry units into smaller sub units, squads, with platoon support by way of BAR as a sort-of LMG. The Brits were similar, with each platoon having Brens, GPMG were held, in both British and US doctrine, as the Company level. At the German Kompanie level, the Weapons Abteilung was far more likely to have 37mm PAK or super-short infantry howitzers.
Now, in the Pacific, the BAR probably had much less influence overall, mostly from the short engagement ranges. Which makes an interesting comparison, as the Japanese fielded a couple of LMG, and a BAR-equivalent. None of which were superlative in the defense, as they were largely used in lieu of a GPMG.
Which all points to a fundamental problem with LMG in general: They are too heavy in offense; and too light in defense.