I think that the user BiiivAl might be using bots/multiple accounts to put their reviews above others for a few reasons. For starters, they had recently made their account and from June 2nd (first review) to June 14Th (latest review) they have made 73 reviews in that time. On June the 4th they made 14 reviews alone, a sizable amount of reviews, with most to all of them containing 3-4 long, comprehensive paragraphs. They also have multiple reviews in a row that have the exact same number of helpful ratings. I put in one example where they get 34/34 helpful ratings 5 times in a row on older movies that would have a relatively low amount of traffic. Same thing happens a few times where they get 49/50 helpful ratings 4-5 times in a row as well. I find it difficult to believe that 34 people had looked at their reviews from only yesterday for Ant-Man, Avengers: Age of Ultron, Guardians of the Galaxy, Captain America: The Winter Soldier, and Thor: The Dark World and all gave it a helpful rating especially when compared to other reviewers who had reviewed the same titles either earlier or roughly the same time and only gotten 0-3 ratings. I can't be sure, but the number of reviews, ratings of the reviews, and newness of the reviewer seems like a fairly sketchy combination.