Terrrrrible test.
This is the equivelant to standing a squad of Obers next to some shock troops and saying the Obers are under performing because the shocks win and Obers are anti inf.
In fact this test is great at showing how tactical use of units is a must in this game. The only reason the panther won in most of those was the slower rotation speed, so other tanks got 1st shot.
If you get outmanouvered at close range GG... why didnt you kite with excellent RANGE, ARMOUR and PENETRATION..
I think what people do when they get a panther, and Ive done it myself, is think, right awesome, I have high armour and speed, I can just stomp my enemy with it, and get very recless and carless with it.
But if you play cautiously with it, using combined fire arms of shreks/ATguns as a fall back / flank protection, what do you really expect your enemy to do then to take it out.. their armour will be constantly scared off and forced to retreat, then you need to win the inf engagements.