Best film Jane Austen? Easy: Pride and Prejudice and Zombies.
I think that one adds evidence to fboab's theory. It's funny precisely because it's a send-up of all those frightfully serious screen adaptations, and the simple addition of zombies gives the characters something to *do*.
It's still about 30 minutes too long, thobut.
On a related note, I've been reading Mary Robinette Kowal's
Glamourist Histories series (which is basically a fantasy romance featuring a mash-up of assorted Jane Austin characters), for
SCIENCE, on the dubious basis that I enjoyed her space stuff and it came up in a twitter thread. It's entirely readable, again because those characters are given a plot to participate in.
(My main conclusion is that as the inspiration for both Sir David Vincent and Dr Nathaniel York, Mary Robinette's husband must surely be a fine example of non-toxic masculinity.)