This looks like a fabulous pop-art blitz of Native American and comic-book iconography. Too bad the show was in London and has closed already.
I imagine the show's message is something like this: Americans have appropriated and exploited Native images for commercial and entertainment purposes. Now artists are appropriating and exploiting American themes and styles to fight back. They're showing us how the mainstream has distorted Native culture in a virtual fun-house mirror.
But a caveat: Judging by their reaction to the infamous NFL SUPERPRO #6, I doubt the Hopi would approve of FAILE's using their kachinas in their art. This is where a Native artist might've handled the material more sensitively.
For more on the subject, see Comic Books Featuring Indians.