ISU is one of the worst vehicles in the game right now, It is only mild effective if you stand in front of it doing nothing, and with the high price and pop it's actually a detriment for you.
Not to mention ISU is completely vulnerable to pretty much everything and needs a LOT of support to operate.
Show me ONE game where ISU actually made a big impact in recent times, you are not gonna find it, the 14cp requirement means that by the time it hits the field the game is already won or lost.
I would say the vehicle actually needs some sort of rebalance to be viable.
Loop is right, I have been saying this for over a year.
It's insane how accurate indirect fire is on moving squads, even when they don't kill any models you are forced to retreat pretty much every time because your squad lost 40~50% of their health in one shot thus becoming useless in combat.
some sort of LoS problem, when he play the animation he might move a little and lose LoS while he has it when standing up, other units have the same problem sometimes.
Can I suggest a feature? make the calculator take into the account the receive acc of the other squad (i know it will be a lot of work but just throwing an idea)