I doubt that it is trolls because Amazon requires you to buy the product before rating it. However out of the thousands of people who bought it from Amazon we are only seeing 400 reviews so that is a relatively small number compared to the total bought. Best to wait for more information. Hopefully it is a minimum amount of failures rather than what we may or may not believe.
EDIT: Apparenly it doesnt require you to purchase an item but it does verify who has bought it and who "says" they have.