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Marvel's teenage superheroes have not historically fared very well, and have frequently failed to make the transition to adult superheroes (characters like Shadowcat and, obviously, Spider-Man being the obvious exceptions). So a new team consisting of teen heroes, and legacy heroes at that, has some convincing to do with regard to their relevance.
I would argue that this book was succesful in achieving just that. In a very short space, it managed to introduce new and original characters, and make the reader invested in them individually and as a team. It uses familiar characters (not wanting to spoil which) enough to establish a connection of the Avengers, but without them stealing the spotlight from the new additions. The fact that this is one of the more diverse teams Marvel has come up with in recent years only further adds to their appeal (though it will undoubtedly be considered a disadvantage to certain anachronistic fans)-the lead-up to a certain scene with Patriot is nothing short of brilliant.
The new characters are all connected to the Avengers, some in direct, others in less so ways. Wiccan, the young magic wielder and Speed, the team's speedster are connected to the Scarlett Witch and Quicksilver by more than merely their power sets. Stature is actually a character first introduced to Avengers canon as the second Ant Man's Scott Lang's daughter, and here she is following in her father's footsteps, including becoming the latest superhero to display growing/shrinking powers. In contrast, the newest female Hawkeye has no solider connection to the the original Hawkeye than simply thinking his costume was cool, and Patriot has a definite link to Captain America, but not the one you'd expect.