I concur...perhaps it is a stinker, but I’m not going to rely strictly on the word of Hollywood critics. Arthurian legend was not written as a screenplay, and so it is possible, or perhaps even likely, that strict adherence to the stories may not meet the standards of millenial critics who have never read the literature.
I went to the movies recently. Trailer for this started playing. Audience reactions: booing, laughter (not the good kind), and one WTF.
My favorite take on the Arthurian legend is that by Stephen Lawhead, his entire Pendragon Cycle series.