I would argue that both films don't take advantage of their premise- Fatman has a premise I wanted to see in a movie all my life and then it is quite dull. The black humor doesn't work at all and a bigger scale of the film would have helped.

Violent Night is even worse- interesting premise- opening scene is kinda fun and the we cut to this boring white rich family about whom you have no incentive to care about. The film is tonally all over the place- family film for kids and then a slaughterfest with a boring choreography. Very dull. Shorter runtime would have also helped.

Fatman is more survivable but squanders its cast and premiese