Re: Two things about this.
Basically, I agree with the gist of your post, but...
My title was designed to direct this as a reminder to people who were posting that they were going to buy Dell laptops because there was no 15" PB update, or a similar move. Not confrontational, but rather a reminder maybe of why they left.
Also, while I'm no expert, I have to think that *nix-based systems have to have more diagnostic tools for finding security flaws than Windows. (Remember the much-dreaded release of "Satan"? That was a program to detect security flaws in Unix systems.) With tools like these, there really must be fewer holes.
Also, it wasn't clear to me why your statement that M$ is a mediocre company is a sequitur to your contention that we don't know just how vulnerable OS X is.
(Oh, and if you read the article, an analyst said that until it was fixed, a system was "like swiss cheese". That's not small potatoes.)