I have seen all of the TD bounce on Panther frontally and the most surprising was ISU bouncing on pz4 okw vet 2 frontally which happened with me. Out of all TDs except ISU panther's shot does not bounce. Yeah they are a problem I guess also the blitz panther gets on vet 1.
Has there been any replay where the ISU has wiped a squad with full hp?
Have to see the OHK radius, but to me this is like people saying the ISU AT is bad. I've been using ISU on AT regularly for the last week or 2 and I've killed tiger aces, elephants, JP4s, Panthers etc. It's not bad, you just can't expect the ISU to 1v4 multiple AT sources.
People saying that a panther can 1v1 an ISU are doing it in a vaccum. In real games you're on rails and metal, there are mines, snares and other tanks. Flanking isn't always an option, and frontally the panther loses.