I've been a big supporter of the show, and I'm not one who typically compares books to movies. I did read the books, but each stands alone for its entertainment value. It can be very different, and yet if it's awesomely entertaining, then who cares, is my view.
A few of my problems with this season, at a high level:
1. Whole thing feels RUSHED. I'd love to see Arya's reaction to learning that Jon isn't her half-brother, but rather is her cousin, and is the rightful heir to the Iron Throne. Nah, just skip.
2. Bran is boring and emasculated. I struggle to believe GRR Martin went through all the trouble of making him the Three Eyed Raven to be so impotent.
3. The fleet sneak attacking/killing Rhaegal was ridiculous. A fleet of warships doesn't sneak up on flying dragons. Even experienced (doubt they were) ballistae operators couldn't fire a very small number of shots, from a moving, swaying platform, and hit a rapidly moving target at long distance. Hell, all they had to do was show a mass volley fire and I would've been fine with it. Instead, it's like 5 shots, and three hit. And that's after they somehow sneak up on the flying dragons. Jeeeesus that's dumb.
4. Bronn's entire scene was stupid, other than his introduction. The entire storyline for this character was the ultra-practical, far smarter than the average bear, ultra-mercenary. But he now thinks, because he made one random threat against Tyrion and Jaime, that he will GET Highgarden? Hell, he shouldn't even be dumb enough to believe that Tyrion COULD give it to him. Tyrion is the HAND, not the Queen. How the actual **** can he successfully convince Dany to give Bronn THE MOST VALUABLE great house of them all in terms of wealth? It's beyond absurd. And it's just not in keeping with what Bronn as I have understood him to be would do.
I'm not going to say the show sucks. That's a bridge too far, but there have been disappointing moments. VERY disappointing moments.