The son of close friends of many years came close to marrying badly. The father did not see the problem but the mother did, recognizing from the start that the girlfriend did not smile and look adoringly at her son. Among other issues, her assessment was that "If you aren't equally head over heels for each other at the start, the marriage will not last."
The mother shrewdly muted her adverse comments on the match and delivered them only in private to her son. Six weeks later the son recognized that his mother was right and dropped his girlfriend.
A year and a half later he married a new girlfriend and they now have a lovely baby daughter. The video and pictures that I have seen of the couple consistently have them smiling as they steal glances at each other.
I’m sure there are instances where Mom is right, some where she is wrong.