I primarily enjoy the artistic style, personally. I used to buy Metal Hurlant before the English version (Heavy Metal magazine) was available, and I’ve never learned French.
But I’ve come to appreciate the Kimiko Ross stories, too.
I suspect that if an artistic endeavor works for absolutely everyone, it’s probably not good art. It seems like there needs to be something more than just pretty colors, mass appeal or lack of controversy; to my mind the McDonald’s cheeseburger is not a work of art, regardless of what Andy Warhol or Marcel Duchamp might say about my unsophisticated tastes.