I'm speaking with regards to a government sense. Mayor. Governor. President. Something where he's had to serve as an executive over a form of government. To me, his business executive experience is similar to how I view someone who served in the house...its helpful experience, but its not directly correlating experience.
Even in the business world, I wouldn't say someone who was president of a non-profit focused on Resturants would be greatly experienced to be the CEO of say Hewlett Packard or GM. While it speaks to some of the skills he may have, the realities of what the jobs focus, duties, and responsabilities are may be significantly different.
He's never had experience running any kind of government entity...not an executive branch agency, not an actual executive branch, nothing. He's got little to no legislative experience. For all the talk that went on about Obama, if Obama was a "rookie" then Cain's not even in Triple A yet.
I admit, I like his business experience, but we're talking about running the most powerful country in the world not a regional pizza chain.