For me, the best part of the movie was that i could predict the pace that the movie will follow across the screentime. I could also predict when the movie would end but i was glued throughout the one and half hours of the movie.
This movie will start off relatively slow considering the comedic pace it picks around the middle ; introducing the characters one by one in the classic british comedic fashion that is making out every character to be somewhat goofy so that they could be laughed at. But there is a comedic climate right from the start so that the audience are glued to the story wanting to laugh out more.
The brilliance of this movie is the sheer comedy it picks up at around the middle of the movie. Everything that could go wrong, starts to go wrong for the characters. The writers leave very little time in between the jokes and so while the audience can barely recover from the previous event, they are thrown another hilarious work of comedy.
This is spread across beautifully throughout the movie. So much so that after the initial 20 minutes, you wouldn't even realise that you gave another hour watching this.
Truly one of the best dark comedy movies ever.