Really? Maybe not all at once, because Marvel hasn't launched this many books at once, but glancing at July 2010, Hawkeye and Mockingbird and Young Allies were both at least 4,000 below 25k on issue #2, and that wasn't unusual for the time, since books got cancelled at issue six back then on the regular. Sales across the board were down: the 138th best selling book in December 2015 was ~20k, whereas in July 2010 it was ~13k. So it's hard to call this an across the board catastrophe, though I do wonder if bundling up books in a relaunch like this has had a negative sales effect on some of them. But, going back a couple years, I also think you have to realize there's no guarantee that Marvel would hype their lesser-known characters even if they were launching them a lot more slowly. Depressing to think about, but there it is. Marvel has a set marketing budget, too, and probably most of that money goes into stuff with the biggest chance of success.
I agree that there's more focus on the already popular characters than the comedic characters, at least from Marvel. But you might hear about some books more on the internet than others because of fan reaction. People talk about books like Squirrel Girl here b/c so many people dislike the book, and then some people defend it, and then on and on. Just like it's the stuff that people post on tumblr that gets circulated. I don't think that diminishes the criticism about Marvel about not advertising its product properly, but if you are sad there's no discussion thread on CBR for a book you want to talk about, you can start that thread.