Creative teams do matter but they are not always sufficient. There are plenty of comics, good runs that didn't do as well as it should, which got cancelled and so on.
In the case of New Avengers, you had Bendis but he also got to do one of those "Absolute Firsts", i.e. an Avengers ongoing with Spider-Man, Wolverine, Cap, Tony, side-by-side...aka the actually most prominent and famous Marvel heroes in a team together.
So yeah the team counts for some but what truly gave New Avengers value is that it had Spider-Man and Wolverine as regular ongoing team members of an Avengers team for the first time. That's what gave it value.
Without that, I don't think it's reasonable to expect and assume that New Avengers would have been as successful as it became.