I found one flaw in this book: Fontane has that peculiar habit of describing the most unneccessary things in vivid details, whilst brushing off the important plot points in a tiny little sentence.
I loved this book nonetheless, simply because Fontane so masterfully describes people, who feel real and have their flaws. And who simply are stuck in the rigidity of the time they are living in.
It´s not a perfect book, but it´s still fabulous. Effi Briest is recommended reading in the German schools, but I never had to read it for school. Even more so, I´m glad that I finally picked it up.