I haven't used it yet but I'm sure it's great!! (Five stars)
or
Looks neat! (Four stars)
or
GOT THIS LAPTOP FOR MY GIRLFRIEND AND SHE COULDNT FIGURE OUT HOW TO USE IT. I CANNOT BELIEVE THIS. FOR $200 I SHOULD GET A TOP-END MACHINE NOT THIS TRASH. I AM RETURNING. (ONE STAR)
It's difficult to sell an item when you have no ratings at all or very litte ratings and a competitor has hundreds, so I can understand why they give products away for ratings. I think Amazon are looking into marking those reviews more clearly.
When I am looking for something, I go by the amount of reviews, too, so I really can't blame them.
Personally, I just ignore those reviews. Reviews in the 2-4 star range are more useful anyway.