I disagree. Mr Collins and Lady Catherine, as well as Mrs. Bennet, are satirized for a reason, and it is because Jane Austen clearly saw the likes of people who feel over-important. She would have placed them in a position of power and control rather than in a comical role.
Also, Mrs. Bennet is not only ridiculed by the reader, but by her husband, her daughters, and clearly she embarrasses Elizabeth in more than one occasion. Similarly, Mr. Collis is often mocked by both Elizabeth and even Mrs. Collins (Charlotte) herself at some point. All these characters share the same annoying and ridiculous behaviors.
Although Jane Austen was a part of the gentry of her times, she did not see herself as a social reformer in the same way that other writers felt they should become. Instead, Austen would acknowledge the social situations in the same manner that all the other ladies of her class did. Back in Austen times women developed workforces to deal uniquely with the needs of the poor. As a woman who epitomizes her times, Austen surely did what all the other ladies would do, which is to join the cause and advocate for others in writing.