What is the ruling on praying behind an imam who does not recite the Quran well, given the impossibility of asking him to step down, and is it better to pray behind him or to wait for a second congregation and miss the virtue of the first congregation?

If the Imam does not recite audibly in an audible prayer, then according to the Shafi'is, following him is not valid, and the prayer must be repeated by agreement. However, if the prayer is silent, then his imamate is valid, and a second congregation should not be formed to avoid discord.