To shoot glass objects properly, there is more to lighting than just lighting. Glass objects will only look better if there are shadows. Since glass is transparent, it does not throw much shadows. But glass is reflective, so you create reflections on the glass to make them look better and more 3D.
This is a good video on shooting glass.
[video=youtube;BlQwt7_ZXKg]http://www.youtube.com/watch?v=BlQwt7_ZXKg[/video]