Progressive though Austen certainly was regarding gender equality, 'Mansfield Park' makes it blatantly clear that she was a lot more traditional when it came to subjects such as religion, city life and moral transgression.
The upside to all these well-principled motifs is that the novel is all the more consistent.
There is, of course, the marriage plot and the social criticism, as per usual, but there is more than that, as well.
Right up there with 'Pride and Prejudice' and 'Emma', therefore!
Previously re-read, to lesser satisfaction :
'Sense and Sensibility'