Marriage is perfect. it is two imperfect people committing themselves to a perfect institution, by making perfect vows from imperfect lips before a great God.
You will agree with me again that marriage institution is perfect. This is because God who made marriage is perfect.
...even as your father who is in heaven is perfect -Matt5;48. He made marriage to be a perfect institution, And God saw everything that he had made, and behold, it was very good -Gen 1;31. Also in Deuteronomy 32:4 said thus, He is the rock His work is perfect.
Marriage institution cannot be faulted in anyway. the only imperfection you find in marriage is people in the marriage - the man and his wife.