Steve Jobs was, quite likely, one of the biggest jerks in Silicon Valley history. I've worked with two people, over the years, who worked closely with (or directly under) him, at one point or another, and they both
loathed him. I mean
serious hate. It was pretty shocking, as they were very calm, likable folks, otherwise.
He was, unquestionably, a true visionary, though, and his obsessive, brutal management style, allowed him to implement his visions, with little interference. It reminds me of the "bad guy" in Braveheart, Edward "Longshanks" the First. He was a complete bastard, but he also unified a lot of what is now Britain.
Steve Jobs was also an outstanding persuasive speaker. He could not only convince you that the world was flat, but sell you First Class tickets, on a boat to the edge. The "RDF" was real.
But so many people think that dressing, and acting, like Steve Jobs will somehow allow them to channel him (see: "Cargo Cult"). They get the "asshole" part down, but can't quite synthesize the "visionary" part.
It's a bit ironic that Tim Cook is sort of the polar opposite of Jobs. It seems to me, that he's actually a rather decent chap (as much as any CEO can be).