I do agree that the Avengers line is being stretched. Marvel (and DC and probably economics in general) always spam something that is working well until it is overdone and then crumbles. Happened with the X-Men (to a degree), happened to Wolverine as well as Ghost Rider and Punisher in the 90's and eventually the Avengers band will snap.
However, even with the X-Men brand being a little past its prime, Marvel still feel content to have 4 core X-Books (5 if you count Ultimate X-Men), as well as spin-off's such as Uncanny X-Force and the like (such as Wolverine's two books, or Deadpool's series, etc.). So I don't expect it to change.
Greg Land's art is a downer. The writer is an unknown to me as I've never read his work before. However, I like Blue Marvel, Power Man, White Tiger, and Luke Cage and have nothing against any of the rest of the cast besides Spider-Ock. I'm not sure who Ronin is this time; could be Echo again or maybe even Iron Fist in disguise?
Anyone who gives Pym crap about never picking a codename and settling on it needs to be shown Monica Rambeau and told to shut up.
I'm not getting all of the other Avengers books, so I probably will give this a try. Great to see Adam Brashear/Blue Marvel back in circulation. Marvel readers probably know Kevin Grevouix best for that awkward (at best) NEW WARRIORS run, but this character was pretty solid. He'd have made a good SECRET AVENGER to be honest, but I'm fine with him here. There is a part of me that feels the biggest "black hero" who is missing from the line up is Black Panther, and if She-Hulk can now appear in 3 books at once, why not him? But it's a minor quibble.
The Avengers are quickly becoming the Defenders, a team where everyone in the universe from Stingray to Silverclaw to Tagak the Leopard Lord is a member of one of the other. But in the end it's all about solid characters and good stories, so I probably will give it a try.