Adaptation doesn't mean complete recreation. What do you expect the show to do? To have Sansa's actress sit on her ass until they know what the hell is going to happen to her in the books? These are the realities of TV.
I have no issues with the changes they're making, in fact, I wish they had more drastic cuts earlier in the show. For too long they've attempted to cram as many characters and plotlines as possible with zero regard to pacing and actual theming. This show has often felt equally bloated and underdeveloped due to the slavish nature of the adaptation of the books. Yes, slavish, in spite of all the changes they've made in previous seasons. I'm not saying the show will magically improve in all regards, but shit, it's about time. Besides, they had no choice. They're running out of material anyway.
And as a book reader, this is the most interesting and intriguing the show has ever been, personally.