As far as Bendis having a distinctive style, like a Tarantino or Mamet, that's not what makes Tarantino or Mamet talented. That's a weakness, when you have everyone of your characters sounding the same regardless of background, age, sex, or culture. Having a similar feel or tone to their work (which I see more in Tarantino) is fine, but the dialogue should reflect who the characters are. You should get a feel for who they are by the way they speak. Perhaps in a Resevoir Dogs or Pulp Fiction characters sounded similar (though not as much as a typical Bendis comic), but if you look at something like "Inglourious Basterds" he'd moved far away from that.
And as far as his "risky" move of adding Wolverine and Spider-Man to the Avengers, they're two of the (if not the two) most popular characters in Marvel's universe. There's no risk there, it was just never done before because either (in the case of Spider-Man) they were loners or (in the case of Wolverine) they were killers who didn't fit the profile of what an Avenger should be (and had their own team, and cause, to fight for regardless).
All that said, I have enjoyed Bendis on Daredevil, Alias, and Ultimate Spider-Man, and if he tries out GotG I'll probably read the first issue to see how it goes. I do hope it's the original version, as I don't feel as much of a connection to the Yondus and Starhawks of the world and wouldn't feel the need to compare his take to the last series. Besides, those characters could use an update (or at least an ongoing title).