I have worked on well over 250 websites and most sites I have worked on have a BR from 15% to 50% and one as low as 3%, but instead of speculating in what is good or not why not let the words from Google's own Analytics Guru tell us what his POV is: "According to Google Analytics Guru Avinash Kausik “It is really hard to get a bounce rate under 20%, anything over 35% is cause for concern, 50% (above) is worrying”. Low/Good bounce rate indicates that visitor engagement on your site is good." There you have it. To add some statistical research here some research findings from rocketfuel.com that has his numbers staggered a little bit different, but kind of along the lines with Avinash: "As a rule of thumb, a bounce rate in the range of 26 to 40 percent is excellent. 41 to 55 percent is roughly average. 56 to 70 percent is higher than average, but may not be cause for alarm depending on the website. Anything over 70 percent is disappointing for everything outside of blogs, news, events, etc. - See more at: http://www.gorocketfuel.com/the-rocket-blog/whats-the-average-bounce-rate-in-google-analytics "
