The hunter/brawler role is simply not working in a cost-effective manner. Armor is borderline useless vs AT-guns and tank destroyers. Diving you more expensive panther against another tank destroyer will most often result in a loss because of snares. Right now the panther has the honor of being both the worst and the most expletive tank destroyer in (maps with lost of shot blockers and 4v4 blobfests changes this).
I must disagree, AT Guns have a good 20% chance to deflect against a Panther, hardly reliable but with 960 health it does inspire confidence. Tank Destroyers are squishy which makes the Panther overkill for chasing them, but even just chasing them away and backing off is a win. Furthermore you could also use the Panther to hunt down any medium tank or push away IS-2 or Pershings. The Panthers high health, armor, and mobility combined with Blitz make it the undeniable king of dives.