I will say that, for my ex's completely computer illiterate parents, a mac mini is wonderfully intuitive. And not the M$ where-did-we-put-your-file-menu-oh-now-its-a-non-linear-picture-bar-that-changes-layout-with-your-resolution-and-window-size "intuitive".
I dont disagree with anyone who says that the Mac OS is intuitive and MS have often cocked things up, or simply changed them enough to screw with the minds of the users of older OS's.
And while theoretical Mac OS viruses exist, in the wild they are effectively non-existent (obviously due to OS market share and not any work on Apple's part).
That point, although it is true does not in anyway state that Viruses and Malware do not exist, I always say the same thing about software of any form, would YOU write it for ~ 5% of the market or for 95%, if you want to piss off a lot of people you dont do it the Apple way, if the tables were turned in terms of market share the tables would also be turned in terms of the share of Viruses/Malware. Simply put, if YOU write software or viruses or Malware then its much "better" to hit the big markets than the small markets, go for MS rather than Apple or Linux. Remember that Linux has a small market share, take its virues/Malware into account as well when you consider MS/Apple and viruses.
Finally, because of the general lack of malware (and service packs which decimate older hardware forced upon the tech-illiterate), their five-year-old mac mini still works great. I admit I cannot speak to Windows 7, but I find the majority Windows installations (regardless of user literacy) tend to get bogged down as they age.
My parents PC has worked perfectly for a similar time with no problems, again it should be noted that it is very difficult to show who wins and by how much, there are simply to many variables - so I suggest that we all agree to ignore this point as no-one will ever "win" a point here, so lets not bother trying. FYI just for a laugh, I once saw a PC that was running "Windows (dog-shit) 98" that had been running for over 2-years non-stop
I went out of my way to see it with my own eyes.
Finally, there is the good old my-machine-has-been-on-for-N-years argument. Again, I cannot speak to Windows 7, so maybe this is moot, but the mac mini mentioned above is only off when the electric grid goes down. They never have to restart for performance reasons, ever.
As per my last answer it is impossible to even say if that is normal (and true e.g. not a harmless exagaration).
I will never pay the Apple premium myself, but I do see the value in a machine "just working" for those who can't format a disk to save their lives
Yet I know someone who blew loads of cash on an Apple because "they are so intuitive and so much easier to use than a PC", he cant use his very expensive Mac either, and he only has his Mac recommender to show him, rather than "everyone". Where would you rather be.? screwed but can ask 95% of people for help, or screwed and only able to ask 5% of people for help - mass market share DOES have real benefits sometimes - like having a Nokia phone 10-years ago, someone WILL have a charger that you can use.
EDIT: Added in.
1.) Several proof-of-concept viruses have been written for OS X in the past, so this isn't the "first." They never propagate.
2.) When you download this .tgz file in Safari, Safari warns you that it's an application, and you have to click to continue.
3.) When you run it, an admin password prompt is displayed by OS X, and you have to enter it to continue.
Like I said--FUD of the day.
FUD is the answer there, no sane person claims that IE is competent, let alone perfect - personally I have considered its use as "a security risk" for a few years, FF + AdBlockPlus is much better if at least for the security questions its asks you, and the fact that it is much more difficult to "click" on a link in an otherwise harmless porn-site that will take you to a malicious one - seriously if you use FF and dont us ABP, do so.