The rape-revenge genre is rife with dodgy exploitation pics and under-the-counter sleaze, with I Spit On Your Grave (Day of the Woman) being the most (in)famous and, possibly, the most misogynistic. Artistic merit is not something the rape-revenge film concerns itself with (let's face it, 'Last House on the Left' is a crude, artless fluke), concentrating more on graphic sex / nudity for graphic sex / nudity's sake. Oh, and the rape has to be really horrible to justify the rapists' sticky end (no pun intended).
If you're watching a good example of the genre, you'll be putting yourself in the place of the woman and relating to her, something the horror genre frequently does (it's one of the only genres where men will relate to a woman) and wishing her attackers dead - in any way possible, not necessarily in a sensationalist way.
I think Freeze Me (or Freezer, here in the UK) succeeds in this, as the plight of the female character is always put first. Agreed, there are a lot of gratuitous shots of her naked body, but these act as a reminder to her beauty and frailty. When it comes to the rape, it is often more implied and in no way staged to be titillating, something the more dubious examples try to achieve, rather disturbingly.
Freeze Me, therefore, isn't exactly an enjoyable experience (I'll have to look up the word 'entertainment'), but it is thought-provoking, well-made on a very tight budget, and incredibly disturbing. One of the best examples of this horror sub-genre.