From June 12th, 2012 to March 2nd, 2013, 50% user give 5-star rating, 50% user give 4-star rating. for Bugdroid+ chrome extension.
Neat little bit of customization for Google Chat. Works in G+ via Chrome as well as in the Chat for Google extension. To earn 5 stars, the green should color match Google's palette and Androids should match Gmail Chat column look.
Hope google will enable this at least in labs, as Scot said.