It really depends on the situation and the car. I’ve had it really help and not take over too much (very modern Porsche in the mountains), and systems where it was actively making the situation much worse by alternately locking the brakes on individual wheels. That was down a long hill which turned icy a third of the way down in a borrowed 2013 BMW F30, and I still consider it luck that I kept it on the road and nothing was coming the other way.