Such a fascinating industry.
From what I gathered, and the tapes I saw in the early days, Steve Austin was a great technical wrestler, with a look, but rarely able to show his promo abilities. That's the man Bischoff fired, which I don't fault him for - I do fault him for firing him via answering machine while he was injured, though.
The fact is that firing lit Austin up. When he went to ECW, Heyman was at his creative peak, and luckily had a history with Steve. So they let him go wild and do his own thing, allowing Austin to be creative by tapping into his anger. Those were great promos and I recommend anyone interested in that kind of history to track them down.
Austin hit a wall when he was saddled with The Ringmaster gimmick, which stifled him until he was finally allowed to be himself again. As was mentioned here, Bret saw real talent and wanted to push him, and that's probably the best handled program of the modern age in that it both took it's time and didn't overstay its welcome. The story was always there in the background, and the blowoff worked: Austin transcended to the Main Event, and the former biggest Babyface in the company became a massive heel to America, and a God every where else in the world.
If a sincere documentary is ever done about Steve Austin, warts and all, I'd absolutely watch it.