Well, you must remember that Marston had a much higher pedigree than most other comics writers of his era. Most of the other writers DC had working for them were kids in their late teens or early-to-mid-twenties, most of whom had no education past high school level, and were pretty much flying by the seats of their pants in terms of writing skills; they learned as they went along. Marston, on the other hand, was a man in his forties who was not only college-educated, he was a professor of psychology; he'd invented the lie detector, been interviewed for magazines - I mean, the guy was a minor celebrity in his own right. It's hardly surprising that he was a good writer. The man had talent; he succeeded in just about everything he put his mind to - and luckily for us, the main part of that was Wonder Woman.