However, it seems her characterization and sexualization have been exaggerated some (and unfortunately) for the different medium.
(The sexualization is there in the Murata version, too. Have a look at the manga volume 10 cover for a particularly egregious example.
The original webcomic doesn't sexualize anyone, though.)
Neither I'm saying that you guys can't hate or whatever you guys want.
Personally, I enjoy her character design (yes, even though it's pandering, it's sexy).
I was talking about character development. Since her character hasn't developed on the manga, they won't add it just to make you guys happy. Wait for season 2 or continue to hate her or whatever, just know that in this arc, she won't get any development (besides showing off her power and annoying personality).
You can't just tell someone to "wait" for the character development to come around. This is some people's only One Punch Man experience, and they may not necessarily want to read the comic, ever. There may not even BE a season two, ever! So for them, Tatsumaki is, and will always be, this character. And, no, season two, if it happens, won't address her story, either, because it probably won't reach that far in the story, so that's an odd thing to say.