I have acquired the entire audiobook collection of Jane Austen books :) I decided to listen to them all in the order that they were written, so these two shorter stories came first.
The interesting thing about this story is that it is only a small fragment of the bigger story. It really seems to not have enough development to have been meant to stand alone. It's sad that it was never finished because the little bit you can read is enjoyable.
This story is written almost entirely of letters. Each letter is from one character to another and explains the plot through each person's point of view. The conclusion at the end is the only non-letter section and it is told through an omniscient narrator who explains what happens after the letters stop. I know this is a crude explanation of the book, but I wasn't too huge a fan. Most of Jane Austen's stories have a wholly likable main character who you are rooting for. Lady Susan is far from likable. The only consolation is that she doesn't get everything she wants in the end. I'm glad that I read this, but I can certainly see why it's not one of Miss Austen's better known pieces.
Sorry that neither of these is a very thorough review. They were short and I read them over a week ago. And I just can't do more at the moment :)