She-Hulk was created essentially in the rush to create new characters of the 60s and 70s. Stan Lee admitted that they created characters like Ms. Marvel, Spider-Woman, and She-Hulk to deprive their competition of making female versions of their most popular heroes. Hence we got the first iteration of She-Hulk.
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The main issue with these attempts was that they were either bland or bad. Ms. Marvel volume 1 was pretty bad (yes, even Claremont can make stinkers) while She-Hulk was just a less inspired copy of the Hulk. Spider-Woman was the less bad of the bunch thought even still it wasn't very good. So it was no surprise that Ms. Marvel and Savage She-Hulk were eventually canned for low sales.
Enter John Byrne, who was placed to write Fantastic Four at the time and actually did something with She-Hulk in his F4 run, making her replace The Thing for a few issues but eventually things returned back to normal, yet it was clear that Byrne liked the character, and eventually opted to write her for himself in a new run. The difference was that she was given an original twist of being a fourth-wall breaking, comedic character, taking digs at Marvel itself and the comic book industry as a whole. Essentially Deadpool but more subtle. It actually worked because it gave the character something different than just being double X-chromosome Bruce Banner.
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The reason Mariko Tamaki's versions sucks ass is because we've gone back to what was tried at first, and didn't work: a Hulk knockoff, only this time with hamfisted politics, shitty humor, and terrible writing as expected of Tamaki.