I thought I was going to watch a black comedy...
Instead what I watched was some sort of indie drama with pointless violence and gore and no comedy element whatsoever.
Braindead is a black comedy, this was just painful and boring, If this drivel had been American it wouldn't have gotten nearly as much praise, but it was a British indie 'black comedy' and the fact that most of the people who praised it on their reviews were unredeemable snobs who usually have their heads so far up their asses they wouldn't EVER give a proper horror or a proper comedy more than 3 out of 10 just speaks volumes about how much hype plays a role in these people's perception.
I have also seen Kill List which I though, once again, it was an indie turkey but with loads of violence and gore and yet still incredibly boring and pointless. But in fact Sightseers is just as 'humorous' as Kill List, even though the former wasn't trying to be, and just as boring.
You just can't make a black comedy without the comedy part, it just doesn't work.
I myself could think of many 'black comedies' in the way Ben whitley conceives this genre, for example let's make a black comedy based on the Joseph Fritzl case where he kept his daughter in a basement for 24 years.It will be so bleak yet humorous!.
We can have a Fritzl type of character behave all 'awkward' and stuff, maybe in one scene he is having sex with a dog and in the next he is raping his daughter (this would be funny because of how gross it'd be that he put his penis first in the dog and then in his daughter) Then we can have hilarious black comedy dialogues between him and his wife like "why do you prefer our daughter?" and some quasi college humour situations (ala dog licking balls of main character in Sightseers when he is having kinky sex with girlfriend), but it will be an English film, and the camera will be slightly shaky (to convey intimacy) and the cinematography will be very bleak with washed out colours (so beautiful and artsy), also all lines, even the 'comedic' ones will be delivered flat just like in your usual pointless indie drama and numerous hipster songs will play through the whole thing, especially songs featuring an acoustic guitar and some guy singing.
Prepare yourself Ben Wheatley, I'm about to step up the game so high your next movie is going to need real child molestation and perhaps to be filmed in sepia to get you some of that sweet ass snob critic's praise.