When done well, a skeuomorph helps a user to feel comfortable with an interface. Slight textures in digital interfaces help them to feel tactile. Good skeuomorphs take cues from an analog world to help a user navigate a digital one. when done poorly, the skeuomorph forces the user to deal with an interface in an outdated way by blatantly ignoring the fact that the interaction is being done on a platform that is capable of handling new and improved interactions.

This "page turn" skeuomorph really bothers me. If there is to be any animation at all, it should be to cover up load time, and the user should not have to click and drag with an extremely RSI-incuding stroke to get the page to turn. It feels like the page weighs 50 pounds. Digital interfaces are not material. They are supposed to be frictionless. They are supposed to take the work out of interaction.

I want to click on the right side of the page and have the animation quickly play so that I can get to my content. Focusing on the entire page flip takes me right out of the content.

I know that a book in real life takes some effort to hold, and some effort to flip a page, but designers should really reconsider designs that "look pretty" but keep that same effort around when they translate a book into a digital format.

I cringed when I first saw this kind of behavior in Flash. One or two people figured out how to program a page turner, released a tutorial and everyone was off to the races to create their own. Excellent programming exercise - extremely bothersome UX. Now we can see the entire thing play out again, in high def CSS!