I have seen a lot of people complaining about this issue. But yet there is no reliable data and statistics about this available and might never will be. The only references people can give, are their personal experiences. And these experiences contain mostly situations, in which they felt, that the armor combat system didnt work right. While situations, where everything went as expected, are mostly forgotten and do not contribute to the mentioned "negative" experiences.
So it might be, that such strange situations only happen in 1 of 5 shots or something, which isnt to much, but might appear to high. I dont think the biggest problem is the tanks, but might be feedback. Thats the main problem.
I am sure some of the mentioned situations can be explained by damages caused by the angle mod. The angle mod leads to more random outcome of tank combat. There is always the possibility, that you can hit an angled part of your target causing only minor damage, while your enemy get lucky and kills you in one shot. Ofcourse the tank models need to be cleaned of to any angled parts, which cause to strange damages.
This adds a kind of "randomness" to tank combat (not exactly randomness, but I dont have a better word for it), which may even grow and range, as aiming only a half pixel to the left or right, might not cause any or even more sufficient damage on target.
I like this system, as now a tank battle can still be over in one shot, or can last for several minutes. Even flanking gets more and more valueable. The systems still needs some more tweaking and adjusting on damage.
But I need more playtime with this patch, to get a more detailed view on it. But time is, what I dont have to much, so people with more playtime should talk about this.
Just my two Pfennig.