How Did Ozzy Get Famous?

First of all, don't doubt my passion in metal (especially 80's), I breathe, bleed metal and I love Ozzy's works.
I understand his position in the metal world and he's the "godfather of heavy metal"

But at times I just couldn't help but think that he got famous because 1) he's a crazy ,
2) he got lucky with finding the most ridiculous guitarists on this planet: Rhoads, Lee, and then Wylde.
Like without those geniuses flying on their fretboards... I don't see how Ozzy can ever get famous?
Admit it, he is not the most competent vocalist... It took me awhile to get used to his singing at the beginning.

Excuse me if I sound ignorant.
I know I'm uneducated in Ozzy's history, hence why I am questioning.
I also know he published an autobiography, but I haven't read it.
If there's something from that book that would open my eyes, I'd gladly hear it!

Thank you so much!!

You guys are welcome to check out my Crazy Train solo cover in Slash costume
http://www.youtube.com/watch?v=QxdC7TOrI-A...mp;feature=plcp


edited for language - tony on behalf of the moderating team