I actually watched this movie this past week and really enjoyed it! It played around with the tropes of the classic UK murder mystery (which I love) - striking scenery, mysterious characters, and two hapless stand-ins for the audience played by Adam Sandler and Jennifer Aniston who add a touch of humor to the proceedings.
I hope that MURDER MYSTERY's success leads to more films in the genre - comedy / crime-solving capers with surprise action elements.
As a sidenote, it also lent itself to a rom-com format of sorts - bringing our lead couple closer together through celebrating their anniversary and whirlwind circumstances! And the comedic touch of the horrible bus tour that Adam Sandler wanted to take them on made me laugh.