To new watchers I would say - watch season 1 as a stand alone. There is a lack of coherent plot and any depth to characters beyond the first season - it's thin like butter scraped over too much bread. Season 1 is a fantastic standalone.
What a horrible way to treat some of the most interesting, Arthurian-inspired source material. It's all written for you!!! Don't write your own crap. Offensive to book fans. Incoherent as a stand alone.