They are deviating from the books a lot and it cannot be helped. Some of the changes have been good, others have not made much sense but whatever - I try to judge the show on its own as much as possible.
So far I am enjoying the season. Personally, I would always prefer more Arya and less Dany - true also in the books for me. On re-reads, I often skip Dany chapters.
Regardless, this season has been pretty enjoyable so far with the exception of the Sons of Harpy episode which blew chunks and made absolutely no sense.