Janet Todd at the TLS:
Mansfield Park is her most daring book. Knowing she had a great popular triumph in Pride and Prejudice, Austen deliberately created a heroine without the endearing qualities that made Elizabeth Bennet universally loved. Jane Austen liked pewter – we have it from her letters – yet not enough to repeat the winning romantic formula when she knew she had a supreme talent for fictional experiment. She wrote of Emma, that she’d created a heroine no one but herself would much like. The opinion better suits Fanny Price, through whom she provokes the reader to address the difficult truth of stubborn integrity.
more here.