There are many benefits, provided that there are empowered assistants at work helping the two conditioned souls regulate their lives, so that spiritual progress becomes possible.
Recently, yet again, a devotee expressed his lack of faith in arranged marriages pointing to the shockingly high divorce rate in ISKCON. As he was a sincere soul, I pointed out to him in return that karmis are certainly not less affected as devotees are by Kali. The argument that; “unless both, the boy and the girl like each other, how can the marriage work?” is irrelevant from all points of view. It assumes that arranged marriages are conducted by artificial force, which is in itself a wrong assumption.
It also advocates the sensual platform of perception which may quite likely result in unwanted progeny. First of all liking or not liking is entirely a product of the sensual and mental platform and as such can change instantly according to the movement or changes of the modes of material nature.