Dont think anyone has suggested the crew has done anything wrong.
But it is amazing how many people here jump to the "Yawns" and "tis no big deal" thing. (again)
I can tell you for most people in the public it is a very big deal. And very scary for them if they experience it. They dont care if it is rapid slow or even managed well by the pilots. All they care about is it happened!
The VERY big deal here, is the continuing perception of another qantas plane in another incident. The qantas image of a safe airline is taking a serious beating.
(Justified or not)
At some stage the management will have to start looking at the hard reasons for this.
People have a choice of airlines and they wont spend their dollars on airlines that are even perceived as unsafe.