I still need to see Kill List, but I found Sightseers to be a dark treat once it gets past its unnecessarily cruel opening. Between this and Spring Breakers, Criterion really picked a good year to re-release Badlands. Wheatley's relentlessly dark sense of humor is best served by the moments in-between the violence, though the murders are all creative enough to get a chuckle of their own. Wasn't completely mad for it, but it has finally given me the curiosity to try his cult breakout once I get the time.
My full review is up now at Spectrum Culture.