The basic gist is: "Holland March (Ryan Gosling) is a down-on-his-luck private eye. Jackson Healy (Russell Crowe) is a hired enforcer who hurts people for a living. Fate turns them into unlikely partners after a young woman named Amelia mysteriously disappears. Healy and March soon learn the hard way that some dangerous people are also looking for Amelia. Their investigation takes them to dark places as anyone else who gets involved in the case seems to wind up dead."
And yes, it is supposed to be a comedy. It has a very high brow humor (something like "The Royal Tennenbaums") so my cousin and I found ourselves the only ones laughing. It was sometimes stupid humor, sometimes just absurdity so not sure if the rest of the crowd wasn't picking up on it or what. I will say that the plot got away from us though. We were confused as to why Amelia was trying to be killed and Ryan Gosling's daughter (in the movie, not real life) was driving him around because he was too drunk. But she looked like a teenager so we were like is this just supposed to be absurdity or is just sad that a father is too drunk to drive himself so his 13 year old daughter has to? But the daughter is delightful in this movie.
All in all, I'd say you could skip it and if you like that type of humor or are fond of the '70s nostalgia then rent it/stream it. But I really didn't see how it got such a high percentage. Perhaps not growing up with these movies (I'm an '80s baby) I didn't truly appreciate the art. I mean I laughed but I wasn't blown away. So overall, meh.