I really do not get why Bob put The Green Knight so high on the list.
The more I've thought on it, the more I dislike the film. Unlike the original tale Gawain isn't a noble and good man, he's a very flawed man, and unlike the original, Gawain of the film is perfectly willing to not only make selfish choices throughout, he only finally makes the right decision at the end after having a vision.
In the original Poem, Gawain wasn't a coward, and he wasn't selfish. He didn't sleep with the Green Knight's wife and his only failing was when he took the sash that made him invincible. And in the poem, when he finally gets to the Green Knights chapel where he'll have his blow returned, he survives but is nicked on the neck. Once the game is over, the Green Knight tells Gawain that it was all a trick by Morgan le Fay, and Gawain feels ashamed because he lied and and was decietful. He's then reassured by the Green Knight that his only crime was to want to live. He then keeps the magic sash as a token to remind himself of his failure, and to keep himself honest in the future.
In the film, Gawain passes none of the tests set out and only reveals the sash after his crazy psychic vision of himself becoming a despot. He even sleeps with the wife of a man who has been providing him food and shelter. I wasn't at all bothered by the fact that the Green Knight would kill him. (Apparently its supposed to be ambiguous and that he may have survived. I don't know.)
The only thing I think the movie really has going for it are the visuals, but you can get most of that out of the trailer for the film, and you'd save a good hour or so