One of the good and bad changes they made was to the readings during mass. They got rid of the second Gospel at the end of mass, and replaced it with a first reading, from the Old Testament. They also introduced a repeating three-year cycle of readings, to replace the one-year cycle. The idea was that Catholics should be more like Protestants, who actually read the Bible.
...That is something you guys do, right? Because we basically skipped over the Old Testament in our masses during that time period (1570 to 1960's).
The Catholics in charge said that the new, three-year cycle would give us a wider selection of readings from the Gospels, which would give us a more accurate picture of Jesus. While it's true that there are more New Testament readings, they are also very selective readings. Not only do they skip over verses here and there, they also skip over entire stories. Here's a partial list of New Testament readings that you will never hear, if you go to Catholic mass on Sundays:
- Question of Jesus' authority and Jesus' claims of divinity
- Criticism of the Pharisees and other religious leaders
- Feeding of the four thousand
- The third prediction of the passion, and Jesus' prophecies in general
- Jesus' words on faith on how to pray
- The life and death of John the Baptist
- The massacre of the innocents
- The storming of the Kingdom of Heaven (Matthew 11:12-24, Luke 17:20-25)
- Various healings and exorcisms (blind man at Bethesaida, Garadine swine, the epileptic demoniac, healing of the woman on the Sabbath, healing of the man with dropsy, and others)
- The cursing of the fig tree
- Condemnation of this evil generation
- Weeping over Jerusalem
- Calling of Philip and Nathaniel
- Jesus' appearance to Mary Magdalene, after his death
Important Note: If you go to daily mass, you'll hear a lot of these omitted passages. So it's not like they never get read. It's just that 90% of Catholics won't hear them.
Personally, I think the Catholic leaders of the time period would have benefitted from hearing those Gospel passages, where Jesus criticizes the false hypocrites who abuse people in order to have a cushy life. That "brood of vipers" (Jesus' words, not mine) serve themselves and their own agendas instead of God.