Opinion journalism can be more honest than objective-style journalism because it doesn't have to hide its point of view. It doesn't have to follow a trail of evidence or line of reasoning until one step before the conclusion and then slam on the brakes for fear of falling into the gulch of subjectivity. All observations are subjective. Writers freed of artificial objectivity can try to determine the whole truth about their subject and then tell it whole to the world.
Slates founding editor Michael Kinsley has written an interesting piece questioning the relevance of objective media in a realtime, always on, connected world. Hat tip to Paul Mason for the link. Recommended reading.