So I'm not much of a reader of medieval poetry or romance. I've read The Song of Roland and Beowulf, of course, but I'd be lying to say I feel confident interpreting the work. That said, a few thoughts (replete with spoilers):
* I totally saw it coming that the king was the Green knight. I probably knew that somewhere deep down in my grad-school memory, but I didn't actively remember it. That said, when the Queen offered Gawain her magic girdle, I was like "Booyah! That's the Green Knight's protection." Nailed it.
* The hunting and excitement were amusing, but it made me wonder why everybody thought Gawain was so great. By my reckoning, the king went out hunting every day while Gawain slept in and fended off the king's randy wife. Of course, the whole test was devised by her for, um, no reason at all as far as I can see.
* Arthur and his round table must have been one badass bunch of dudes. Picture it, somebody rides in during Christmas dinner and says "Check out my big ol' axe! If somebody chops at me with it, I'll return the blow one year from now." The knights take him up on it and, after Gawain chops off his head, are surprised to find him taunting them and riding out. They laugh about what a great day it is. I'm sorry, if I see some dude's head get cut off and then he gets up and says "no problem," I don't put that in my "great day" column.
* There's an awful lot of space given to preparing Gawain's horse for the road and the sacrifices and prayers said on his behalf. I'm reminded of Eric Havelock's Preface to Plato which suggests that these long passages in poetry are actually bits of instructions, important knowledge embedded into the poem. Like the advice for card sharps built into "The Gambler." My Kenny Rogers knowledge tells me when to walk away, and when to run.
* The Green Knight's kind of a dick at the end. First he starts to swing the axe and, when Gawain winces, taunts Gawain about being Chicken. Then he swings it again and stops just to, um, wind him up some more. Finally, he gives Gawain a little nick on the neck and then says "FOOLED YOU!"
The Librivox reader, mj, does a fine job with the text, though there are a few fits and starts as she stumbled over a few passages. Otherwise, well done.