Many artists claim that art critics find it is easier to write about art that they dislike than to write about art that they like.
Conclusion (it follows)
Most art criticism is devoted to works other than the greatest works of art.
Evidence
Most art criticism is devoted to works that fail to satisfy the critic.
Evaluate
The first sentence ends up being an irrelevant part of the paragraph, since the author goes onto say, .
Both the premise and the conclusion are structured the same: Most art criticism is devoted to works that are X thus, Most art criticism is devoted works that are Y
So we're looking for a very simple "If X, then Y" type missing link
Goal
Since the argument goes Most art devoted to works that [fails to satisfy critic] thus, Most art crit devoted to works that [other than greatest]