Good copy stops you to read. Bad copy as well (so in that way mediocrity is something you should avoid):
I like to read paper newspaper as it keeps me in touch of the current decline of print advertising (not to mention Straits Times gives interesting viewpoint to the society, mostly by what it omits to tell). This ad is a good example on why we should already move to machine-generated creatives for majority of advertisers.
Of course AI will eventually be able to do even better, more touching and innovative creatives than we do at the moment. Meanwhile we should at least try to differentiate a little, show what humans are better: emotions, insight, feelings. If we cannot add even a little bit of magic to whatever we do, AI will overcome us faster than we have predicted.