Although "mama's boy" has negative connotations (he was smothered or spoiled by mom), a man who was raised with love and affection by a mother with boundaries often grows up to be what the author of Raising Boys Without Men calls a "head and heart" person.
This positive version of a mama's boy, says Peggy Drexler, is in touch with his and others' emotions and knows how to communicate. (This is assuming the mother herself is connected to her emotions and is a good communicator — a big assumption.)
Have you ever dated a man who was close to his mother? Was he spoiled, expecting you to do everything dear ol' mom did? Was he smothered, one wig and a rocking chair away from being Norman Bates? Or did it help him to respect women and teach him to be connected to his feelings?