If the Pope is not speaking ex- cathedra a faithful Catholic not only he/she can criticize the Pope, that they must when if he is going against the Magisterium of the Church.
Francis is disarming and silencing of Catholic bishops, priests, and laity. Holding firm to Catholic doctrine and practice seems like an act of disloyalty to the pope, yet to acquiesce is to betray the Church.
The fact that the Church’s traditional enemies approve highly of him raises concerns, not least because of the Lord’s warning that “If the world hates you, know that it has hated me before it hated you. If you were of the world, the world would love its own...
Melchior Cano, a Spanish theologian at the Council of Trent, warned against obsequiousness regarding the pope: “Now it can be said briefly that those who defend blindly and indiscriminately any judgment whatsoever of the Supreme Pontiff concerning every matter weaken the authority of the Apostolic See; they do not support it; they subvert it; they do not fortify it. … Peter has no need of our lies; he has no need of our adulation.”
In our time, the 1983 Code of Canon Law also recognizes the right of the faithful in this regard where it states that “according to the knowledge, competence, and prestige which they possess… the faithful have the right and even at times the duty to manifest to the sacred pastors their opinion on matters which pertain to the good of the Church and to make their opinion known to the rest of the Christian faithful…” (§ 212:3).