I can't handle it. It bleeds me out all game. I mean, if there were a way to counter it, but there isn't. If you somehow manage to surprise the OKW player and flank the ISG, the lack of teardown and fast movement speed makes it impossible to kill.
It is far from impossible to kill. Tanks or flamers kill it in seconds. Grenades too.
Shooting it with riflemen is obviously not going to work amazingly well though.