The people who seem most sharply criticized for their misuse of wealth is the Ferras family.
Mrs Ferras maybe small in stature, yet she is cold and formidable. And she's spiteful in Ch. 34 when she particularly requests to see the sceens- then loses interest on hearing they were painted by Elinor.
There was no need for Mrs Ferras to mention Miss Morton, it was Elinor's work.
On this point, I can't help sympathizing with Marieanne's rashness, 'This is admiration of a very particular kind !...It is Elinor of whom we think and speak'.

The narrator also suggests, that socially speaking, the origins of the Ferras family are not elevated. They have no relations except the Dashwoods by marriage. Why are Mrs Ferras and Fanny so keen for Edward to enter politics or at least drive a barouche ? Why are they so opposed to Elinor's marrying Edward ? Possibly they are a family of newly established wealth bent on securing their place in society ?
Why does Mrs Ferras speak so glowingly of Miss Morton being the daughter of Lord Morton ?
Admittedly this is inconclusive- there is silence on the matter of where their wealth comes from, and Mr Ferras is never mentioned.
Edward is the most amicable one of the Ferras family. Early on, Elinor noticed his sweet countenence. Since then, relaxed and away from his family and relaxed he has revealed himself as intelligent, well read and possessing a dry wit.
Yet Edward can only define himself by negatives-he does not want a distinguished career nor to drive a barouche. He would like to become a clergyman yet this is not smart enough for his rich and disagreeable family.
And his mother expects him to marry the Honourable Miss Morton although he has been secretly engaged to Lucy.
Poor Edward ! With such a family, no wonder he seems so frustated and morose.

Apart from Edward, the Ferras family have little personal merit.

Robert is a fop and a dandy, of no more significance than his showy toothpick cases. Yet the Chronicle of Robert Ferras does not end there. As a man of fashion he indulged in the cult of rusticity. In ch. 36, he declares himself 'excessively fond of a cottage'.

* I am still trying to figure out Robert's unusual talent for 'twisting his head into a bow'. ;D