The turret is quite easy to penetrate even by panzer 4 and pak 40s, almost all kill shots or critical hits to my is2 were always to the turret, one thing I like about the is2 is if you are having trouble killing something just shoot the enemy tank’s turret near the bottom with high explosive and you’ll kill it
IS-2 is lighter than Tiger II, but much more nimble.
You can easily retreat back into cover and even if you dont have cover you can win time by reversing slightly in an angled way to prevent the enemy from locking on your weakspots.
IS-2 is easier to take out by shooting for transmission though. Easy OHK for 88.