That used to be true, however currently, I think that's not accurate, look at Anands reviews of Apple products for the last few years.
You might also ask the manufacturers about how "mediocre" the iPad is, they seem to have a hard time keeping up.
I keep seeing phrases like "The XXX tablet is the best tablet that isn't the iPad, but if you want a tablet, buy an iPad"
But hey, hold onto those misconceptions.
To be fair, Pliable's comments are only misconceptions when it comes to the ipad and, perhaps, the iphone. Apple's mac books and desktop computers are powered by equipment that was, in many cases, old 2 years ago.
Part out the hardware in a macbook pro (minus gimmicks like the thunderbolt I/O that likely won't catch on), and you will see that Apple is charging a ~30-40% price premium for a decent OS and a really nice design. The only reason I own a Macbook and am contemplating replacing it with another is because it is wife proof (my wife doesn't need me to tell her how to operate it) and because it interfaces seamlessly with the other Apple devices we own (2 iphones, 1 ipad).
That really sums up Apple's genius in a nutshell. They make a useful product that is idiot proof, reasonably powerful, and very, very pretty. That is what 80% of the market wants. Us geeks on Anandtech don't give two shits about the design because it does nothing for us. And we don't care about usability because we are, in most instances, power users who know how to get what we want from less user friendly platforms.
Case in point, if you think Linux is user friendly, the Apple OS and hardware is not likely to impress.