there is no good or bad, there is just

suitable or not. he might not be hu*****and material for you, but that doesn't exclude him from being hu*****and material for others.

Besides, it is rather complicated between daughter/mother-in-law(to be). usually there's no right or wrong in that "triangular" relationship.

You may think he's biased toward his mother, which may not be the case to the eyes of the third party. Even if it is, don't you think he has the right/obligation to, to a certain degree, as the mother must have worked very hard and sacrificed very much to raise him, alone?