This movie is more frightening because it is going to happen. Please understand, it is not a question of "might happen" but WILL happen. It might be a year or five years. It might even be five centuries but sooner or later someone is going to start splicing human genes with animals and this movie does an excellent job of showing the result.
OK....partially. The super superior combo that is the 'monster' in this is not the likely creation. No, instead the part of the movie that is the most accurate is the extremely human child hood of the 'creature' growing up, and the monstrous way that the scientists that created her treated her.
This movie is definitely worth watching, if for no other reason that to understand that sometimes there really *IS* a reason to grab pitch fork and torches, but not for the 'monster' but for the real monsters that make them. And they will.