Historically, the heavy losses of German armor on the offensive in World War Two are accurate. The Panther et all were fairly effective on the defensive when they could get in first shots from concealment or cover, but on the offensive again, Mortain, Arracourt, and the Bulge being fairly representative, they didn't go so good.
The Hellcat works more or less as intended, it can shoot you and opt to leave if it feels it is not in a good place. If you do anything to get it into an engagement area in which it doesn't have standoff or a place to run, it doesn't live very long.
It might be a little OP simply for how many you can get and how early. But the idea of Teutonic Panzer Knights rolling over anything in their way isn't representative of historical reality, and a lot of the German armor died exactly how the critical hit system works, non-penetrating, or spalling type hits that disabled the tank enough for it to be unable to continue the mission, or forced to be abandoned.
The Hellcat works more or less as intended, it can shoot you and opt to leave if it feels it is not in a good place. If you do anything to get it into an engagement area in which it doesn't have standoff or a place to run, it doesn't live very long.
It might be a little OP simply for how many you can get and how early. But the idea of Teutonic Panzer Knights rolling over anything in their way isn't representative of historical reality, and a lot of the German armor died exactly how the critical hit system works, non-penetrating, or spalling type hits that disabled the tank enough for it to be unable to continue the mission, or forced to be abandoned.