I skipped over the two posts marked "Redundant" during my Meta-Moderation service. Call me lazy, but I don't have the time to click "Show Context," switch my threshold to -1, change my Display Mode to "Flat," and then read through all the comments on an old article just to see if this one comment is truly "Redundant."
There should be a special "Meta-Moderator" viewing style, which would only be available when a meta-moderator clicks "Show Context." It should display the article comments -- stripped of usernames, sigs, and scores -- in flat viewing style, and should visually highlight the comment to be meta-moderated, so that meta-moderators can more efficiently see if the comment deserved to be moderated "Redundant."
Otherwise most of the users asked to Meta-Moderate, including me, will continue to leave the "Redundant" mods unchecked.