WARNING! SPOILERS!!!!!!!
It has been a few years since I have read it and don't have my copy to hand, so I will try and remember some of the bits that annoyed me the most. Mary is suddenly incredibly beautiful and feisty and traipses around the country, trying to support poor workers (or something of that sort). Darcy is a jerk, especially to Elizabeth, for most of the book, and even at one point reflects with regret that he didn't marry Caroline Bingley (!!!). Elizabeth has lost most of her wit and spirit - Darcy crushed it out of her. Eventually they become reconciled, but it seems pretty forced. Darcy is also very nasty to his son, thinking that he is weak and gay because he is a clever and 'pretty' young man. He finds out that he misjudged his son, but from memory doesn't apologise for his years of nasty comments. Bingley is a cheating cad, with heaps of illegitimate children, which Jane calmly accepts. Finally, old Mr Darcy turns out to have been a smuggler, involved in all sorts of shady dealings. The shades of Pemberley are polluted, indeed!