Dr. Peter Kwasniewski has a recent article out discussing some benefits of the Usus Antiquior. Without endorsing all of his arguments, he makes the following excellent point:
A Better Way to the Bible. Many think that the Novus Ordo has a natural advantage over the old Mass because it has a three-year cycle of Sunday readings and a two-year cycle of weekday readings, and longer and more numerous readings at Mass, instead of the ancient one-year cycle, usually consisting of two readings per Mass (Epistle and Gospel). What they overlook is the fact that the architects of the Novus Ordo simultaneously took out most of the biblical allusions that formed the warp and woof of the Ordinary of the Mass, and then parachuted in a plethora of readings with little regard to their congruency with each other. When it comes to biblical readings, the old rite operates on two admirable principles: first, that passages are chosen not for their own sake (to “get through” as much of Scripture as possible) but to illuminate the meaning of the occasion of worship; second, that the emphasis is not on a mere increase of biblical literary or didactic instruction but on “mystagogy.” In other words, the readings at Mass are not meant to be a glorified Sunday school but an ongoing initiation into the mysteries of the Faith. Their more limited number, brevity, liturgical suitability, and repetition over the course of every year makes them a powerful agent of spiritual formation and preparation for the Eucharistic sacrifice.