100% disagree, her backhand was so solid even in defence from big hitters like Serena, Stosor's, Coco's, Key's forehands. She always stepped in and took the big loops topspin shots early. There is no denying the fact she could hit easy winners from anywhere on court, and keep her consistency up - BEST SHOT IN THE GAME!
If you want to compare with men's backhands in a similar league I'd say Warinka, Gasquet, Nalbandian, Paire. But then I say, image JJ as a man, and how much more muscle power she'd have. Faster reflexes etc... Definitely the greatest shot of all time.