We will have to agree to disagree.
I thought that on comeback in the third Test against South Africa at Perth in 2012-13 he was pretty good (2-54 and 4-110), and then against Sri Lanka I thought he was very good indeed (4-63, 2-16, 0-58, 3-34).
He then had only 1 Test in India at Delhi in which he was wicketless in 19 overs and he was out of the team and the squad!
So his 2012-13 home record was
3 Tests
15 wickets for 335
Average 22.33
Batting Innings: 7, 3, 92*, 13, 1*, average 37.67.
So I think it was a typical Mickey Arthur mistake to blackball him from the Ashes squad. I think Mitchell Johnson's renaissance started a year earlier than it is generally recognised to have.
In addition, he busted Sangakkara's hand in that time!
I think Johnson was almost unselectable by the time of his serious injury in South Africa in late 2011. But the biggest error of the Mickey Arthur era was that in the Test against Sri Lanka in which Jackson Bird debuted he was excessively impressed by Bird's control and couldn't recognise how lethal Johnson was becoming at home.
In the second innings of that Test Johnson took 2-16 in 8 overs, and removed 2 Sri Lankans whom he injured to the point that they couldn't return to bat.
Yet in the next Test Arthur had Johnson reduced to 4th seamer duties, with Starc, Bird and Siddle given the ball before him.
After match figures of 22-2-79-6 in the previous match!