That’s mostly true for iCal and Address Book on OS X, not any iOS app. Those are generally well thought out and they usually at least don’t deceive. Yeah, iBooks for the iPad shows pages left and right that never change, no matter how little or much of the book you have read (which is monumentally stupid) but that’s a little thing.
It's worse with OS X, but iOS has its share, too. iBooks is just one, and it's not just the page stacks. I'd argue that the whole skeuomorphic interface is misplaced. I find the page-turning animation to be a useless, nostalgic novelty. But not just that, I've seen someone get confused by the fact that in landscape mode, each page is printed on both sides, while in portrait mode, only one side of each page is available/printed on. How do you get to the other half? Of course, there are more glaring problems with iBooks. Like scrolling in parts of a page of a book? Pieces of pages that are buttons? A bookmark that's a button?
More examples: Calendar for iPad. (Leatherette buttons? Really?) Notes app. (Marker Felt makes me want to throw up.) Contacts.
