You seem to forget that a) panther is essentially a heavy vehicle
NO! Go back reading books about WW2 !It is medium tank, as the Wolverine and the t34.
No, panther is also good against infantry thanks his mg42, frontal gun and Blitkrieg ("f**k the history" ability)... wich make your panther faster than V1, making simple to crush infantry...
After reading lot of books about WW2, especially Normandy battle (I'm french and i live in Normandy =D), this game lakes historical truth. The Panther was the fastest tank in the war, also a brilliant Anti Tank weapon but clearly 2 T-34/76 or 2 Shermans (75mm one)(at short range!*) could handle it with ease...wich is not the case in this game ; The panther with its AWESOME Frontal armor is really hard to take down.
A mistake with your panther?
Blitkrieg/Smoke/heavy armor... Well don't panic...
A mistake with your SU-85/ T34-76 or IS-2(!)... Not sure you will keep it alive.