Is being unclear a virtue?

Yes it is according to the Emergent/Emerging Church folks. Gary Brady blogs on an insightful critique of the EC given by Pastor Chris Hand of Crich Baptist Church in the UK.

@ Heavenly Worldliness

Bottom line? "The EC is not emerging out of or into a sound evangelical church." Which is another way of saying that though the criticisms of Westernized Christianity by Emergent leaders like Brian McLaren, Dan Kimball, Rob Bell, etc. are often correct, the alternatives they offer are getting farther and farther from Christian orthodoxy.

For more on this subject I recommend Kevin DeYoung and Ted Kluck's book Why We're Not Emergent: By Two Guys Who Should Be.