Anna Karenina is my all-time favorite book, and having watched a number of Russian and English-language adaptations, including the 2012 Joe Wright film with Keira Knightly, I consider this 2000 Masterpiece Theater version the most faithful and watchable of them all. While Helen McRory may not be as conventionally pretty as many other actresses who played Anna, her acting is spot on, and she's closer to the character as envisioned and described by Tolstoy. The other characters are cast very well, and few liberties are taken with the plot. Aside from the now-dated 1977 BBC miniseries, this is the version which spends the most time on the Levin-Kitty storyline, as it should be. The main reason I deduct 2 points is that parts of the series inevitably felt like a breeze-through the book's themes - as no adaptation can truly capture the depth of the original novel.
Review of Anna Karenina
