Not every comic story can live up to the expectations, especially when it's a team as big as Avengers. However, there have been plenty of great Avengers stories out there that not only met expectations, but smashed through them, cementing the Avengers' legend.
The Avengers have always boasted rosters of powerful heroes, but one roster was different from the rest. Norman Osborn's Dark Avengers recast villains in heroic mantles, with Akihiro, Venom, Bullseye, and Moonstone taking the identities of Wolverine, Spider-Man, Hawkeye, and Ms. Marvel, and Osborn repurposing StarkTech armor as the Iron Patriot. Rounding the team out was Ares, the Sentry, and Noh-Varr as Captain Marvel.
The team was introduced in Dark Avengers: Assemble, by writer Brian Michael Bendis and artist Mike Deodato Jr. That first story saw the group get used to being heroes before being called on to bail out Doctor Doom when Morgan Le Fay comes calling. Fans expected a lot from the book, and it stuck the landing completely.