See it if You can deal with what actually looks like a hanging of a live person. It is very unsettling. Black comedy is your thing.
Don't see it if You have no interest in British black comedy. This is THE blackest of them all. You are not a fan of Martin McDonagh.
See it if if a fan of McDonagh & his brand of "gallows humor". Very well acted (especially Dan Stevens & Mark Addy).
Don't see it if you have trouble with heavy Brit accents which can make the plot difficult to follow at times. 1st act too long & could use trimming.