Sun pushed Jini like crazy but only a few people seemed to catch on to what they were talking about, so I don't know if you could say it was "mis-marketed." Some ideas just are before "their time."
While some of the ideas of Jini were before their time, Sun also mismarketed it. They pitched it as an infrastructure for embedded devices and was completely mute on how it could be used in enterprise applications. This was especially bad since at the time Sun was about 2 years away from having a small footprint JVM that would be necessary to use Jini as an infrastructure for small devices.
If you follow the traffic on the Jini forums, it appears that most of the developers are using Jini (and JavaSpaces) for enterprise type applications.