2/3 of a great movie (SPOILERS)

I thought that this film was really fresh and original, taking this female sexual awakening angle to the werewolf, and blending it with the teen life of feeling like a freak while undergoing changes. There's a lot of good stuff there, and it really hums along...

...until the third act. A lot of movies seem to have this "third act" problem, and Ginger Snaps has it, too. Once they synthesize a cure, Bridgette gets a lot dumber for one thing. She figures out it's a cure and instead of immediately going back to get more, she just goes to find her werewolf sister armed with...nothing. Why?

It gets even worse when they get into the last scenes and it's just a bland monster-in-the-house scenario. Actually, they do this three times - at the school, at the greenhouse party, and then at the girls' home. Each set-up is more-or-less the same, only duller each time, because it becomes repetitive.

Movies in this genre have shackles on, to some extent, because they have certain genre conventions to fulfill, but they could at least have done it quicker.

Overall, I like the movie, and it deserves props for the majority of it's runtime, but the end is a little tired-out.