And how is it that you couldn't flank ISU? Why it's immediately gg wp?
Someone in other thread says that killing Elephant requires 2x T34 and a flank. I managed to kill ISU yesterday with 2x PzIV. What is this sorcery?
It depends on map layout, enemy skill and situation. An ISU-152 is not enough to win back a game they have already basically lost since they won't have the units to support it. And on maps without large areas of Line of Site that are conducive the extreme range gun, it won't be game-breaking either. And if htey're total noobs who don't support it naturally it can be taken out too.
However a lot of the most common maps do have big open areas where the ISU can shine, and most players beyond the low ranges are going to know a thing or two about how to support it, particularly if they're following what now seems like the standard Soviet strategy of Guards/Snipers/Cons/AT guns for the early and mid game. Unless you've already broken their back, or can get out an Elephant ASAP, it's likely that the ISU will win the game for them.
I guess the Pak43 is also a solid counter assuming they don't have precision bombing or howitzers. But that is NOT likely in team games.