This episode confirms for me that things will play out differently in the book. For example, Sansa hasn't even met Ramsay in the books, yet, and here she's watching him get eaten by his dogs. Just like Melisandre is still with Stannis at Winterfell, and not at the wall to resurrect Jon.
I wouldn't call this season disappointing, it has been fun to watch, but it's obvious the writers have a hard time writing the series without the books. Many small things that make little to no sense for the books, and lots of filler is creeping into the series.