I'm not really a fan of this arbitrary gray area concerning WW's strength...she doesn't have to be AS strong, since Superman is in some way still DC's flagship character, and Batman arguably their most marketable, but Diana has always seemed to get the short end of the stick, seemingly staying consistently in publication out of fear of losing the rights to her and another company doing more with her...but let me stop derailing...
Diana seems to have always been the least developed, shorthanded, and misused member of the trinity of DC. Her strength has drastically fluctuated from God level Superman strength, to street level Batman strength. It seems as though being "NOT as strong as Superman", and on the other hand, being "NOT as smart as Batman" has been the foundation to her character for which she's based on. I really wish DC, the editorial, and whoever else is in charge of her promotion/branding/marketing will get to setting some consistent staples with her character.