I read his authorized biography cover to cover (ok, listened to the audio book from beginning to end) shortly after it came out, and I can definitively say he was nothing special as far as engineering goes. Even when Jobs worked at Atari, Woz did the heavy lifting.
Jobs was an exceptional marketer and businessman though. Bisi is right when he says Apple would've never made it out of homebrew. Woz is a company man, content to be on the lower rungs of the ladder, and is the polar opposite of ashamed to tell that to anyone who asks. The magic was in how well they complemented each other. Woz is a genius level engineer, and Jobs was a genius level marketer. Neither would've achieved anything remotely close to Apple without the other (and Jobs almost proved it with the startup he tried to do after he was evicted from Apple).
Jobs gets a lot of hate because he was such a terrible human being (and it's trendy to hate on Apple), but you can't argue with his record. He started Apple, made it a multimillion dollar company, got kicked out because he was an insufferable cunt, the company proceeded to churn out the same shit year after year and started failing (and failing hard), the board at Apple re-hired him as an interim CEO (fun fact - everything he made after his return to Apple was called iXXX because he was the iCEO) and it became the most profitable companyin the history of mankind. And Apple's success continues - Q4 2014 they posted the largest earnings statement for a publicly traded company in history.
Anyway, I found his story/life to be very interesting. I'm not sure why there's been so many re-tellings of the same story the past couple of years, but I guess people are still paying so we're going to keep getting more of it.