Or, on the DC side, Ambush Bug regularly breaks the fourth wall--most recently in the Suicide Squad. Does that mean we should be unwilling to suspend our disbelief in other DC comics stories? Are we not supposed to take The Dark Tower "seriously" because Stephen King is a character in the story, and written as the creator of the other characters? Of course not. We've been living in the age of post-modernism for over 60 years now. Kirby and Lee wrote themselves into a Fantastic Four comic very early in the series run--She-Hulk is only building on that tradition. We all know that it is a fictional universe so it is not going to break anyone's illusion if they are forced to actually think about the craft of writing during one episode of one series. Well, plus whatever the hell they are going to do in Deadpool 3.