Mediocre at best unless you're wanting to watch something violent simply just for the sake of it.
Within the first 10-15 minutes you will notice continuity issues, from then it is a mockery of a movie.
The director clearly wanted to make something as jarring yet thought provoking as the 2011 movie "I spit on your grave" and yet ended up spitting on said movies grave. With the lack of original ideas and understanding of its main themes; drug use (the effects hallucinogenic drugs have on a person) and human biology, as well as doing little to emphasise the ideal of female empowerment, which one would assume the overall concept is about, it is overall little more than a glorified gore fest which can only be described as torture porn without the torture or porn. If you want to watch Revenge but want to actually enjoy it then watch the aforementioned "I spit on your grave" or it's sequel instead.