Ignorant criticism is frustrating. This thread and others have been full of people jeering at his Test average and expecting him to fail with the bat. Anyone with half an eye on the Shield this season would have known that he has been batting really well, and (more importantly) has gone a long way to rectifying the problems that caused him to struggle last time around. I doubt anyone who has actually been watching him play is that shocked by what we're seeing.
If people were worried about his selection because his bowling is pretty underdone and he hasn't had a lot of match practice since shoulder surgery, I would understand it - because that stuff's actually true. But most of the negativity is coming from people who clearly have NFI what they're talking about.
The exact same thing happened with Steve Smith when he came back into the side.