The deadly combination: bad and boring.
I didn't find it very nauseating. Most of the gruesome stuff happens off-screen (the film was recently passed by the British censors without any cuts).
It's an interesting horror concept that could've/should've drawn much, much more from the premise - y'know, Cronenberg, Yuzna's Society, the new flesh, stuff like that. But no. The antagonist is frustratingly one-dimensional and predictable, the film never moves beyond the SHOCK of the innovative concept. Too bad.
And pretty much all the dialogue scenes are horribly flat and poorly acted.