As long as you are not using any intellectual property in your review, which you didn't have permission to use (i.e. images/video's owned by Disney), they would have no legal right to rewards generated by users opinions on how good/bad their products are.
It's would essentially be free advertising for Disney, so I would bet that they wouldn't go after anyone who even used their IP... But they would have a legal right in that case, IF they can identify the persons doing so...