Last month I myself gave a sermon to address the present scandal of abuse by clergy of young people.
I am sure it was not disparaging, but it would qualify as critical (in the apologetic / technical sense of the word).
I mentioned two large mega-church Protestant congregations in town. It was something on the order of, "you can certainly find a church that has better pagentry, and more impressive music at X. And you can certainly find better preaching at Y, waaaaaay better than this present homily!
But you can’t find the Eucharist there. You can’t receive the Body and the Blood of the Lord there. You can’t be in communion of belief with over 1 billion people there.
Because without the Eucharist, it’s not Catholic. And if it’s not Catholic, it’s not the Church that Jesus started. Soooooooo, that’s why I’m Catholic, and that’s why I am here, with all of you, in this parish . . . "
Many people after Mass did comment on how lovely it was to hear that all things aren’t the same - the sacraments distinguish our Church, and we ought to be both proud and evangelical in sharing that fact.
Deacon Christopher