OK, in real life, an AP round either punched through the armor, or left a big dent in it, and then bounced off. In the game, we have damage that can accumulate from hits that didn't kill your tank. I guess you could argue that getting hit by a tungsten pointed projectile flying at 1300fps from 2000 yds out will damage your armor, but it wouldn't accumulate like it does (it would make it easier for the next round to penetrate I guess, but your tank wouldn't up and explode from 57 37mm AP rounds hitting the front.
I want it changed so that your gun will still "damage" your target if its a reasonable hit, and that all it does is lower your armor value, "hardness", or whatever the hell you want to call it, by say 5% (or whatever a reasonable number is, I don't know the details of how things work here) of its normal level. I serisouly doubt that an M8 could kill a tiger (or even an M4) from the front or sides before its barrel rusted off. Maybe from the back at point blank range or something given enough time and ammo, but not from the front.