Don't let the good reviews fool you. This is not for you if you like knight films or fantasy. It is not for you if you like heroics. This film is for people who want to deconstruct the traditional tales of honor and heroism, to make the knights a farce.
King author here is not wise, and the round table knights are silent. Sir Gawain, who the story is about, is a sniveling relative of king author who has no redeeming qualities. I won't give away the details, but he is a coward who goes along a journey where others control him and he just goes along with it. He is beaten up by thieves, agrees to every proposed merger even if obviously a trick, molested by one's wife and even kissed by a lord, and has no reaction other than take it.
Did you see in the giants in the trailer? Don't worry, they have no more relevance to the film than the trailer. And in the end, he contemplates running away from his final honor mission, and sees his future as a loser and a failure, and only then decides to uphold his honor. So even the only good honorable thing his character does is motivated by a worse outcome, not by his own inner strength, will, and heroic character.
The worst part it is an insult to the minority casting. The movie wants to be brave by casting a non-white actor as gawain, but then wants to undermine the white mythology and show knight as nothing more then men of privileged circumstance. then end result is not casting minority talent into a role that all people can look up to, but instead cast one into a role that shows knights are weak and only honorable when there is no other choice.
If you hate tales of the knights of the round table, and enjoy movies that undermine honor and heroism, this movie is for you.