I rented it from Red Box out of curiosity since I enjoy a good psychological horror movie.
I watched it once, then skimmed through it again for a second viewing opinion and yeah; the premise was ridiculous and what is presented as being a "viable" medical procedure (vital to the plot as a major portion of the film's shock value resides in the notion that a story like this is actually possible in real life) isn't for reasons already mentioned.
Infection due to contaminated operating room conditions, tissue rejection, blood loss, and the fact that the "grand" medical procedure basically only consisted of removing teeth (see blood loss) and grafting skin. Nothing was done to alter the digestive tracts of the patients, etc. And that's without even nit-picking which isn't even worth the effort.
I'd say offhand that the only value in watching it would be as a curiosity and/or for the "shock value" such films depend upon for viewership.
