I wonder what is the "user" perspective on this. I am not sure everyone hates it - since it feels familiar in terms of structure.
This isn't necessarily true. For instance, if A and B are each measurable characteristics of potential solutions and your goal values A and B equally, if all other characteristics of solutions X and Y are equal, but X={A:2, B:7, ...} and Y={A:7, B:2, ...}, then X and Y are equally "good" solutions according to your goal.
Someone in this thread gave a great example: their company makes "photobooks" and this effect is used in the preview before you order to make it feel more "real". I think that's a legitimate use.
Obviously, magazines that just plaster pieces of the PDF on and then demand the page flip are not usable or accessible, but there are other uses for something like this.
My comment was related to the (common) case where someone thinks this is the best way to adapt printed content to the web, and that people actually want virtual magazines instead of something suited to screen reading/interaction. Fortunately that appears to be a dying mindset.
I find the same with virtually all animations on phones and other UIs. If it can show me what I want a smidgen quicker by not animating then it gets disabled.
Like when your client demands it and you give in?
I've used pageflip in the past and grew to abhor it. It's only quality is the cool factor, which we got over 6 years ago. I hate magazines that use it for their "digital" version.