The books is not the show so stop fucking comparing them and being disappointed
Some changes are good, others are bad. Most of the changes in season 5 have so far been terrible, in previous seasons they made plenty of good calls on what to include and what not to. I'm not disappointed, just annoyed that they've decided to go on some dumb gore-fest, seemingly at the expense of the storyline and everything else that made the show good.
What if they're making this season not as good as the others on purpose.
Think about you have had four seasons where expectations keep growing and growing and it gets to the point where it becomes hard to keep growing the expectations.
By having one season where a lot of it is bad people expectations will lower which means that the next few seasons people will be surprised at how good it becomes.