Like, some tanks are terrible to play and terrible to play against like arties, but how about the opposite?
One example is M4A1 Revolarise. My favourite Tier 8 tank is T-34-3, and if I face it, its 200 APCR would have serious trouble penning me if I hull down or angle my hull, and it's a guaranteed pen even if my shell slightly touches him. So even if he's sniping at me from a bush there is a pretty big chance that his shell would bounce. We have the same alpha and reload except he has to carefully aim. Also, I'm faster, more agile, have better camo and can ram. He can't even run away with his 40 top speed. But the M4A1 also feels comfortable at long range sniping. Its accuracy and shell velocity are amazing.
Another example is IS-7. It's literally god in a charge and can ram hard against mediums, but when I face it in any other tier 10 vehicle, or even my AE Phase I it feels like free xp for me.
Any other examples?