Some of it has to do with anxiety on the part of the readers. In the case of Superior Spider-Man, for example, many readers were legitimately concerned that Peter Parker would never be coming back, that they’d never again have the Spider-Man that they loved. Once it was clear that this was not the case, they were able, some of them, to just relax and enjoy the stories. I think the same thing is true in many other cases–it definitely works this way with a bunch of our Event series. Secret Invasion, for example, became better loved after it was done than when it was going on–in part because some fans were worried that we were going to retcon huge swaths of Marvel history, which didn’t happen.