Google started enabling a vote system based on 1-5 rates for Videos on Youtube. They noticed people were using it as a mere Boolean switch: 1 or 5.

You may use a Star system, but expect rather unbalanced results where most of the feedback will come in the shape of 1(no) - 5(like). You may want to skip the experiment and rather design a simple 'yay/nay' approach.

Relevant Link

[youtube comes to a 5 star realization its ratings are useless][1]


  [1]: http://techcrunch.com/2009/09/22/youtube-comes-to-a-5-star-realization-its-ratings-are-useless/