A Tiger survives 4 shots to the upper side (80mm) from a late Sherman 75mm, which is max penetration.
The 88mm can one shot almost any Sherman to the front (at same range where sherman requires 4 side shots).
No attention is drawn there, the 75mm L48 seems ineffective, while the ineffectiveness of the 75mm L40 matches Hollywood expectations and thus is overlooked.
I would complain about it, but i know that with FH2 we have to have certain limitations like that (Since we can't have complex damage system and tank battles at ranges of 1-1.5 km) if tiger was 1s1k for the 75mm, it would be useless (waiting 5 years for a tank that can be killed very easily by anything), same rule applies to small cannons. Although I would change it to 3-shot kill to the side/read, and 2-shot kill to the 60mm plate.
The biggest problem is with proper "tank killing" guns. Like 75/L70, 76mm, 17pdr,90mm etc. When a tank destroyer (M18 or M36 for example) can't reliably kill enemy tanks, then its useless, since they aren't much good for anything else (open turret, lack of MG's , thin armor).76mm and 90mm not being able to destroy KT from the side in one shot are the best examples (or Marder having trouble ambushing shermans).
In 2.45 there is some weird stuff, M10 is better than M36 for example, simply because M10 has shorter reload time (i think), and it has access to HVAP ammo, giving it superior firepower.