I think just having to watch a significant portion of the video before you can leave a like or a dislike would have largely mitigated the brigading issue. Besides, it would have made the reviews more thoughtful overall.
Maybe removing the dislike count is a simple and effective solution, but I would not call it good or elegant because of its downsides.
Maybe removing the dislike count is a simple and effective solution, but I would not call it good or elegant because of its downsides.