I'm fairly annoyed that Bendis didn't bother to clean up the mess he made of the Sentry. I'm generally a Bendis supporter, but this is one area where he's really stepped in it--he completely changed the character's personality for vague reasons and tampered with his history to the point where it simply no longer makes much sense. I was expecting (or hoping) that the developments in Dark Avengers and Siege #3 meant that Bendis was going to tie it all up and give us the final word on what the Sentry is and how the assorted explanations for the Void work together.
Instead, Osborn babbles about the Sentry being the Angel of Death, Thor hits him with a hammer, and nobody bothers to ask "Why should we expect this death to last any longer than the last two times he was killed?"
Sloppy, sloppy work. The Sentry went down like a chump, too: while Thor was the obvious choice to do the job, the fact that Bob went down so easily doesn't ring true, given all the hype around his apparently limitless power.
I also personally would have liked to have seen some hint of the real Sentry--the one from Jenkins' original series, before Bendis ruined him. The one who wasn't a whimpering puppy. I would have liked to have seen the Sentry take control of himself long enough for the heroes to take him out.
"Fallen Sun" also seemed a little hollow, given that I wasn't sure that the characters were supposed to remember the days before Sentry was a whimpering nothing. Just more jumbled history that needs to be cleaned up. Hopefully, when Sentry makes his inevitable return, it will be under the watch of someone who can clean up this mess and make the character interesting again.
As for the rest, well, an Asgardian, uh, embassy on Avengers tower is pretty cool, and Steve Rogers becoming head of SHIELD is a great idea, even if I and everyone else saw it coming on the last page of "Who Will Wield the Shield?" Also, Spider-Man really needed to get a few good lines (and hits) on Norman; I find it difficult to believe he would maintain such good humour about Norman Osborn running the world.