We have hindsight: the changes Ballmer made to increase revenue were not 'one offs' they were substantial.
1) He reconstituted Windows and Office distribution, sales, put office on the cloud.
2) He launched XBox and more notable Azure.
So if you think 'Desktop is dying' (desktop sales were plateauing) then 1 seems like it's going away and cloud isn't a huge business then 2 doesn't matter.
But the prediction was wrong:
A) Even with flatlining desktop sales, Win + Office continued to thrive. Even to this day. It's not a 'legacy business' it's a 'healthy ongoing business.
B) XBox, in particular Azure are huge. Azure makes more money today than Windows generated in revenue when Ballmer took over Microsoft.
Ballmer's failures were mostly Search and Mobile ... both of which were sad, but also they were up against Google Search and iPhone, the best products of our era. XBox and Azure are in very difficult areas, and are doing well.
In hindsight, Ballmer did quite well, there's not a lot to debate unless someone things that Search/Mobile success should have been imminent, but I don't think that's true.
He massively grew and adapted the baseline businesses, and started a few new, huge businesses. Glorious profits all around.
Satya hasn't yet quite made the kind of decisions that will have the lasting impact Ballmer has had, in his defence, he's in an era were the 'new fields of competition' are less obvious.