For some the word missional itself will conjure up images of colonial imperialism. We intend to use it actually as the very opposite. Not as ways to seek power over, but as a means of serving the powerless. As ways communities, relationships, can undermine the "Empire" of The American Dream of Affluence, Achievement, Appearance, The Corporate Culture of Individualism and Coolness that influences church as well as state. We use the word in its Greek sense of missio, being Sent, being Sent to Serve love and justice.
In The New Conspirators, Tom Sine creates a spectrum or river that includes such streams as "emerging" "mosaic/multicultural" "missional" and "monastic". For missional see his article here at http://msainfo.org/articles/the-new-conspirators-missional-church. Basic missional characteristic, from Sine and Reggie McNeal's work (see book list below) is a turning inside out of time, talent, and treasure from building up "a church" to which people come, to building up "the church" which goes to become itself in the world. Particularly the world of the poor.
Have you encountered other common misperceptions? Issues in trying to "explain" it other than "come and see"? Wouldn't it be, really, so much easier if there were a "red pill" to take? What or who has been your "red pill?"