Tim Challies has a great post here on the hidden beauty of a bad sermon. Make sure to read the whole post but this final paragraph is gold.
Young preachers, new preachers, preach bad sermons. They preach bad sermons as they learn to preach good sermons. And in some ways, those bad sermons serve as a mark of a church’s health and strength because they prove that the church is fulfilling its mandate to raise up the next generation of preachers and the one after that. They prove that the church refuses to be so driven by a desire to display excellence that they will not risk the occasional dud. They prove that the congregation is mature enough to endure and even appreciate these first, messy attempts. There is hidden beauty, hidden value, in these bad sermons.