Jobs made one good decision. His genius was in co-opting the music distribution business, when the traditional publishers had refused to budge on their outdated business models. He even served them a little DRM sandwich, knowing full well that the approach was doomed. Apple's entire success is based upon the well-established success of popular music, built by others, and the hidebound, half-witted way traditional music publishing approached it. The iPod was the gateway device. It lead directly to the iPhone's success, and through a superior iTunes performance, helped as a wedge to get people to buy Apple's overpriced computers. Without the iPod, iLife doesn't happen. Without its strength amongst actual musicians, and the knowledge that came from dealing with them, Apple's turnaround doesn't happen.
As an analogy, he's Bill Gates and IBM. He provided a market solution for a huge market someone else built, when the traditional industries were too inflexible to read the obvious writing on the wall. Just like IBM, and the PC clone revolution. And he was the only one with the insight to pursue it.
Was it genius? You decide. I think what he did was to beat out Microsoft, which actually believed in DRM solutions for content. They too, were affected by the music industry's stupid assumptions about the distribution of content in a digital age, and the ability to control it. Jobs realized DRM was doomed from the get-go.
He also got lucky with the timing, as mp3 players went from 32MB affairs to 2GB+ devices. Without that leap, the iPod would have been doomed.
Jobs knew music aficionados and producers (the real creative talent, not publishers) and acted upon that knowledge. He got lucky with the timing. That's about all he did. In my mind, everything else is fluff. Especially the bits about his brilliance in design. They're not very big shoes to fill.