I think everyone is freaking out with out much thought. How you introduce characters in a book is different to how you do it in a series. They are clearly trying to keep some mystery around the new characters, I believe you'll see them fleshed out later. Explaining every little detail of every character in the first episode would have been boring as ****.
Some sub plots had to be cut, some things needed to be simplified. I don't think they've skipped anything important yet.
I'm up to page 350 of the book, and i dont think craster's house has happened yet... which surprises me that they put it in the show considering i'm 1/3 of the way through the book and not even heard of it, and its in the first episode?
as for 'book fanbois', no... I just think its a terrible idea showing us a bunch of characters and not even telling us their names or what relationship they have with the main characters.
We already knew who the older characters were, why not spend less time on them and more on the new ones to introduce us to who they are? Did we really need to see bran's dream? That could have gone into explaining stannis etc...