Consistently nowhere near as smart, funny, disturbing, or satirical as it should be. While all the scenes on her killing spree are genuinely works of genius, there is a needless amount of time spent setting up this wholly unbelievable killer, and in such a satirical movie, I think everyone forgot that you don't really need to set it up this much, and in such a frustratingly slow manner.
Still, when it shines, it shines, and the gore is genuinely phenomenal, and kills are shot in a way that's uncomfortably intimate as victims die very slow, very deliberately prolonged deaths. Seriously, every moment following our protagonist on her killing spree is a work of genius. And that just makes it all the more disappointing that nothing else is.