The discussion over on the thread about Giganta led me to do some statistics with the help of the DC wikia for Wonder Woman post-Flashpoint.
Villain Occurences Mainline Notes Ares 29 26 Cheetah 63 23 Includes appearances as Barbara Ann Minerva Circe 16 2 Blue Snowman 2 1 Eviless 1 0 As Saturna Giganta 32 3 Only as support or in visions in mainline Zara 1 1 Doctor Psycho 18 0 Angelo Bend 6 0 Phobos & Deimos 10 10 Eris 28 23 Doctor Cyber 13 13 Egg Fu 52 0 Now associated with Harley Quinn Nikos Aegeus 8 6 Tezcatlipoca 2 2 Hades 14 11 Medusa 5 0 Now associated with Batwoman Queen of Fables 5 0 Silver Swan 3 3 Veronica Cale 17 16 Doctor Poison (1) 1 1 Mad scientist Doctor Poison (2) 8 7 Reduced to mundane mercenary Apollo 24 19 First Born 27 25 Derinoe 5 5 Old insane Amazon Hecate 5 4 Grail 26 12 Mayfly 3 3
Mainline is here defined as the Wonder Woman title and annual. Occurences include every other DC title, including Sensation Comics, team-ups and one-shots.
Sure looks like a lot of villains. But several of them have only appeared outside of the main Wonder Woman titles or storylines, and among the non-mythic villains (i.e. not connected with Greek mythology or Themyscira), only Cheetah, Veronica Cale, and Doctor Cyber has had significant presence in the mainline (all by Rucka).
Orlando has been working on developing classic villains in his run, but his run has been very brief. But neither Azzarello, Robinson, nor Finch have done much to explore or develop Wonder Woman's rogue's gallery outside of the Greek mythology. And villains like Giganta and Doctor Psycho are obviously appealing, given the way that other writers pick them up. (Egg Fu is no great loss, given his deeply racist origin.)