One of the times I have laughed hardest in theaters right up there with Lego Batman and some movies when I was a kid like Wimpy Kid and Parental Guidance. It excels in both creating a sense of overwhelming tension as well as some of the funniest dark comedy I have seen. The family was large, but it never felt like too many characters, and I loved the range of motivation and involvement in the game from super gung ho granny Yzma with the greataxe to the more reluctant brother, and of course all the people who have no clue what they are doing.
Overall, go see this movie, the trailers make it look pretty stupid, but you will enjoy it. I know I did