I believe the most intricate plot won't matter much to readers if they don't care about the characters, especially in a series. So I try to focus hard on making each character, whether villain or hero, have an interesting flaw that readers can relate to.
“There have been 111 Justices in the Supreme Court of the United States. Only three have been women. If she is confirmed, Solicitor General Kagan will bring the Supreme Court to an historical high-water mark, with three women concurrently serving as Justices.”