THIS BRIEF REVIEW CONTAINS MAJOR SPOILERS.
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Island was a mediocre seasonal show. But it was rather special in that it set itself apart from the others in the first two minutes of the pilot. Seriously, how could that not picque your interest? It's one the funniest cold openings to any series, ever.
It's rather decent for the first half. It's the second half that crumbles apart a bit, due to the time travel elements and the heavy implication of incest. Other routes from the VN also aren't explored as thoroughly, which makes the series feel a bit choppy.
Though to the series' credit, the art is pretty well done and the time travel concept is a bit like Re:Zero, which is to say it's a refreshing take on it.