One major problem with this movie (Spoilers, maybe)
And I don't think this was intentional by the filmmakers.
I didn't know that she was an alien on a mission until the very end. In fact, I found out that she was an alien only after reading about it on this forum! Before that, and only because of the last scene, I was thinking she might be an android.
It's is vital for the appreciation of this movie to know that she is an alien harvesting humans and that the guy on the motorcycle is her accomplice. Without that, you have a sexually deviant women who picks men up and possibly kills them (I was expecting to see all the men chained in a dungeon or something at some point) and a guy that pops up now and then and you don't know why.
So, basically, had the director properly established from the outset that we are dealing with an alien on a mission, my experience of this movie would have been quite different, for the better.
Was it intentional to leave it vague at the beginning and have the revelation as a "twist" at the end? Or was it just badly executed?
Knowing what I know now about the plot, and had it been executed more effectively, this movie would've been a 7 or even 8, instead of a weak 6.
True Self is righteous. It's a conspiracy to portray Man as a savage that needs taming and policing.