Lots of potential washed down the drain with shitty writing.

Pros
+Great visuals
+Above average Dialogue
+Great acting
+Lots of imagination in the execution of everything makes it really feel like a cool fairy tale
+the first hour and a half of the movie is fairly solid, not perfect but it is entertaining and undeniably cool
+[spoiler]the cumshot scene is fucking hilarious and even though it shouldn't be in the story, it will be the one thing people remember about this movie and it will be the entire focus of every conversation about it.[/spoiler]

Cons
-The writing went off the rails after the first night he stayed in the castle [spoiler]the whole "fuck my wife and then fuck me" thing was an idiotic perversion of the actual tale. In the myth the whole awkward situation of the kisses and the garter is punished and justified in the final act. In this we get some bizarro shame based ending that made no sense in relation to the rest of the story. Instead of "Make sure to stay true to noble values and strive for perfection regardless of temptation/faults" it became "If you do some weird shit then you will feel bad about it for eternity and ruin your life so just die instead" [/spoiler] absolutely baffling how they threw away the framework for a good story to make this trash ending
-They pronounced Gawain like Gawen for some dumb fucking reason. Super annoying