If it was re-tagged as an Adventure-Comedy instead of a Mystery-Comedy, I'd have given it an easy 4.
There are twists and there are unnecessary twists (not even funny). There's plenty of the later (thankfully only) in the last 20 mins.
5 minutes into the film, you know it's gonna be a great comedy. 25 mins into the film, you expect a mystery, but alas it's just a really funny adventure.