we wouldn't be having this discussion if the sherman is the " best medium-medium tank". USF late game is infamously weak without the pershing or calliope DLC.
Well I think it depedens on point of view.
Sometimes it's better to make 3 Shermans than calling Pershing.
But still, out of bigger view, Sherman is best when compare to T34/76, P4 and Cromwell.