As I said, my "favorite" isn't a founding Avenger. That makes all the difference. I hold Janet to different standards because, dammit, she's one of the four characters that have stuck around from the VERY start, and she's essentially the face of women on the Avengers.
As for Tigra? She started off as a serious character. She lost her way. Wasp had a very different origin.
As Gail Simone said (and she may be human, but she's also quite right) "at the CONCEPTUAL LEVEL, I think most of the early DC great female characters were created to be asskickers (though most lost their way in the fifties and sixties), like Black Canary, Hawkgirl, Lois Lane and more. Read an early Black Canary story, and she's taking out a gang with her martial arts skills. Read an early Wasp story, and she's ignoring the villain because her hair is out of place and worrying about how to get the other Avengers to notice her flirting."
If we'd gotten a good story trying to show her progressing from that to a confident woman that could lead the Avengers, it'd be a different story. We didn't. There was no inner turmoil, no character growth, she just went from being airheaded Janet, to abused Janet, to confident Janet in a matter of issues, with no transitions.
As for her "being killed because [she was] shittily written"?
Please.
She's Wasp. Like I said, she's one of the founding Avengers.
She's not gone for good. Not a hope in hell. In fact, unlike the vast majority of dead characters out there, she's guaranteed not just to return, but to probably return in the next few years. In the meantime I'm going to enjoy what this really is: not the death of Janet Van-Dyne, but a break away from her.
You want some good stories with "Janet Van-Dyne"? Ask Marvel Adventures to bring her back to their Avengers team.