There are few difference:
The guy was comparing the barrage ability with auto fire and that is simply misleading.
The ISU-152 shot is vet 0 the barrage is vet 1.
What I have pointed is that if deflection damage is not enough vs high armor target one has the add option of using the skill shot that has higher penetration.
There have been a number of posts describing the AT capability of ISU-152 as bad. I have simply pointed out that with high damage, decent penetration, deflection damage, skill shot and access to mark target describing the AT performance of ISU-152 as bad is simply wrong.
Fair enough. However I think most of us can agree combination with Mark target needs to go, saying the isu isnt bad because of the combination of another ability at all let alone one we agree needs to go isn't really fair. It's like when FMR was OP. We didn't say shock were OP, just that the combination was too strong.
The isu has alright AT. it's not good, certainly not something a player can rely on solely (or would even want to since then it's not bleeding infantry) and it's not bad either. It just is.
ISU AT is a bit like the m42 canister shots. Itll help if you need it to, but if you are leaving it on you are wasting the unit.