Should a husband always give in to his wife’s requests? Is the husband always to blame when there are Shalom Bayis problems? Can we change our spouses when something bothers us?

Are any deficiencies a husband sees in his wife really his own deficiencies, as claimed in the Garden of Peace?
Should a husband ever remark, comment, or criticize his wife? What about for a gross misdeed?
What issues do husbands complain about in their wives and vice versa?
Is there anything that can be done?