The author of the following article recently started up a website and the bounce rate is consistently above 50% even though the content the produced is tailored to the viewers.
The traffic sources are also very specific to his niche market.
Bounce rates indicate how long people stay on your website.
Do they click on and then immediately click off again . . . indicating that the site is not interesting or engaging, or is irrelevant to their search, or worse . . .
Or do they click on and spend a lot of time reading and absorbing your content?
You can read the feedback he received here . . .