Of course I'm bound to reply that his work is art, and to a lesser extent social commentary. And I'm torn on the intellectual property front because I'm the first to scream that my freedom of expression is being impugned if someone tries to stop me quoting, referencing or even re-using something (my YouTube videos are half full of songs that I've changed the lyrics to, which are a copright no-go area that I must learn to stop doing).
I also exhibited and sold a series of canvasses with blown up bits of comic panels, mostly by Kirby. Mine weren't even repainted they were just blown up really big. It's only because they didn't sell for big money or become famous or popular that it'd never become an issue. I argue that my reworking of the source material creates a new artwork, but I also see the argument that the copyright owner of the source material must have rights too.

That said, I blew up Jack Kirby Marvel images, the rights to which were stolen from him by Marvel as soon as he'd drawn them, so who's the villain there?