Popes can err in their ordinary (non-infallible) teaching. Here are two critiques, one of Pope Francis and an older one of John Paul II.
On Amoris Laetitia (on divorce etc.):
On Mulieris Dignitatem (on women):
It is an old criticism of Catholics that we get all our thinking on theology done for us. In fact, I have found that I have to think hard and rely on my own judgement a lot, not only in areas like the doctrines relating to marriage, but also in respect of considering recent changes in church disciplines (“communion in the hand”, altar girls, extraordinary ministers of the eucharist, and so on.)
Another critique of the present pope by a fairly mainstream Catholic journalist.