Brian Michael Bendis' "Avengers Disassembled" event was, all in all, a pretty poor story, apart from the unrelated conclusion to "Thor v.2" written by Michael Avon Oeming, which was utterly brilliant. However, it is fair to say that most of what spun out of it was incredibly valuable, the main exception being Bendis' own "New Avengers" series, which, while a sales hit, has never clicked with me; the AD reboot, however, gave us Ed Brubaker's Captain America, Warren Ellis and then Daniel and Charles Knauf's Iron Man, (belatedly) J. Michael Straczynski's Thor, and Allan Heinberg's Young Avengers, which has a seemingly awful title and premise, but utterly fantastic execution. If you are skeptical, give it a shot.
This first arc, titled "Sidekicks" (something of a misappelation in my opinion, since the characters are not sidekicks, unlike, say, the original Teen Titans), is just about the perfect origin arc for a superteam. Heinberg effortlessly weaves old continuity into his story in fascinating ways, carrying on from the fallout of AD better than Bendis ever did. The Young Avengers first appear in New York, consisting of four heroes whose appearances are modelled on Captain America, Iron Man, Thor, and the Hulk; understandably alarmed, the real Captain America and Iron Man investigate, bringing along reporter and former superhero Jessica Jones (another Bendis creation); and two girls, Cassie Lang (daughter of the deceased Ant-Man II) and Kate Bishop (daughter of a rich family, and the only character without a connection to an existing hero) decide to look for the team, and insist on joining. Hanging over all this is the impending arrival of Kang the Conqueror, arguably the worst foe in the history of the Avengers (he physically conquered the world once, and blew up Washington, although that's rarely mentioned, since it's largely been ignored since). I won't get into much detail on the plot, but sufficed to say that by the story's end the team will have gone through the ringer, and come out both triumphant and sorrowful. Next comes a two-parter (drawn by guest artist Andrea DiVito) that continues the struggle between the Young Avengers and the adult New Avengers over their right to exist, and exposes a shocking secret at the root of one character's powers; after that, a sort of 'secret origins' special detailing the lives of the team before they became superheroes, with several artists; and, finally, a four-part (originally meant to be six) epic involving the Young and New Avengers, the Skrull and Kree Empires, and Hulkling's newly-revealed backstory.
Heinberg's writing is brilliant; witty, dramatic, poignant, and insightful; he takes basic character types and brings them to life. He is matched by Jim Cheung on art, whose beautiful work (albeit with a somewhat limited array of facial types) brings the characters and their world to vivid life. The only flaw on the part of each is how slow they are, but that's not a problem in trade (although it will be when you become addicted to the series, as I did, and are then confronted with the paucity of published adventures for this team). Guest artist DiVito is also high quality, although it is initially hard to see anyone but Cheung draw the team (and I'm not especially fond of DiVito's female faces, which have a sort of pinched quality). A panoply of other artists make small contributions to a special issue detailing the characters' origins, which generally work quite well.
The only flaw to be found is that, as of now, this is the end of the Young Avengers' adventures, and, when they return, it will be to a Marvel Universe that has changed heavily around them, affecting them in the process.