I am not a person who enjoys being edgy or contrarian at all, but my most controversial pop culture opinion is that Wonder Woman's coolest period was the two years of the "New Wonder Woman" by Sekowsky and Giordano, where Diana lost her superstrength, started dressing in a hip 1970s mod fashion, started learning Kung Fu from a little old Chinese man who was her buddy, and became a secret agent, using Asian martial arts weapons like katanas and nunchaku, as well as James Bond esque spy gadgets and supercars. Wonder Woman actually started to have cool 70s girl pals in the big city she could gab with after leaving the dojo, and actually dated guys (gasp!). Wonder Woman's best archfoe, Dr. Cyber, a mix between Blofeld and a lady Doctor Doom, was also introduced here. Also, the art by Sekowsky and Giordano was top notch.
Everyone brings this era up as a "man, what were they thinking" and it really bugs me this period is remembered that way, because it looked great and was really dynamic. I think they created something that could have lasted the test of time, and I am sorry they felt the need to be conservative and rebound to her 50s Kanigher era status quo. Also, I think history is being rewritten. Everyone thought this was very cool at the time (and I have the fanzine articles to prove it) but who will admit that today?