I found much to like in Green Book, a warm dip in what may be some fantasy, which does provide a good buddy dramedy and an amusing role reversal. Seemed like the two guys save each other, to some degree. I doubt the the pianist, from what i know of musicians (living with them, and being one), actually blew off his final gig. At the end of the day, you know that hurts the next group who wants a booking there. And the next.
In a fictional interpretation, however, it delivers an easy feelgood moment.
Not a best pic, imo, but a compelling look at loneliness and oddly matched friends.