So negative reviews has escalated very quickly. Bot or not, I normally trust IMDB ratings. Any movie with rating 6 and above is at least one time watchable. Any series having rating less than 6.5 is not worth. There could be exceptions off course. Are there any interesting incidence of purposefully negative reviews on imdb? One I know of is [1]. The Indian movie Gunday was bomb shelled by Bangladeshi community as some historical reference was not proper.

[1] https://fivethirtyeight.com/features/t he-story-behind-the-worst-movie-on-imdb/