I was long waiting for a good new series and witcher does definitely deliver. It is not a master piece with a complicated plot but somehow simplicity does not disappoint. Although we shall not compare this to GOT but be sure that it is better than season 7 and 8 of GOT. Positive:
Simple plotline to follow
mixture of magic, incredible swordsmanship and fight scenes
locations, cinematography and set design are faboulous
Negative:
over usage of repetative lines and words such as "destiny", "you should not be alone", "I didn't choose", etc. which counts as lazy writing and reminds me of season 8 of GOT.