Great premise which I won't spoil if you haven't read it. (Don't check the Wikipedia page if you want to keep it a secret).

Really fun book, with a really good usage of Matvel heroes and villains.

The other team to "appear" while the Avengers were gone was the short-lived "Heroes For Hire," notable if for nothing else than bringing Luke Cage back into the fold and eventually into Bendis' heart.