Pfft, I still think book four and five are on par with the first three, and all five are better than the show. I understand being disappointed in books for and five if you had waited all those years for them and only got half a stor, but when reading them all in succession they are great.
That being said, I absolutely love the show and have no problem at all with them deviating and altering the books. It's an adaptation, that's to be expected. And some of the changes are pretty damn good. Arya and Tywin's scenes together in season two for instance, and that ending to episode four this season.