ujm, there’s arranged marriages and there’s arranged marriages. Today’s arranged marriages are not like like the arranged marriages of previous generations when it was almost given that the two people who their parents decided to get married would get married. Today the parents vet the buchar or girl and their families and decide if their children should meet but that’s where it ends. It is up to the boy and girls to decide if they want to get engaged or not. This is accross the board, in all sectors of the Chareidi world.
The higher rate of making a marriage work is not just how the marriages are arranged, but within the Chareidi world people generally want to make marriages work out and the key to that is to work on one’s own middos. In the MO world the drive is not so strong to make marriages work out for a variety of reasons.