Satire

According to the back of the book, Sense and Sensibility is a satire of the sentimental novel of the time.

Sentimental novel definition: Sentimental novels relied on emotional response, both from their readers and characters. They feature scenes of distress and tenderness, and the plot is arranged to advance emotions rather than action. (Wikipedia)

Satire definition: a literary composition, in verse or prose, in which human folly and vice are held up to scorn, derision, or ridicule. (Dicitionary.com)

Sense and Sensibility did indeed seem to make fun of this idea, especially Marianne. My favorite of her pointed remarks was when Elinor accuses her of being to open with Willoughby, she replies that should have been "reserved, spiritless, dull and deceitful". Even the sisters are on opposite extremes of emotional expression, especially in response to their men leaving. She also seems to comment on the roles of women at the time. Not only can the family not inherit what's theirs because they are women, but the girls also need to find husbands to get out of the situation. Marianne, however, wants more out of a marriage than money because that alone will not bring her happiness.