The writers post-Martin are just poor at world creating, politics, and characters. They write some lovely melodrama but everything since Dorn has been very poor. Their are so many characters I don't care about and a many that I just don't like at all. I don't care at all about Greyworm, Bronn, Sam, Gilly, all the Dornish (save for Oberyn and his crippled brother), the Greyjoys, and a few others that I can't even recall. Sansa irritates me, I really liked Quasimodo before she was a kick-ass badass, I really liked Cersi as a villain before she was queen, I enjoyed Tyrion far more when he was surrounded by his family as they acted as a foil to his intellect, I try to enjoy Jon Snow and Daenyrys but their acting and dialogue is just very bad, I especially hate how the later is has become the 'perfect good guy' of the show despite the fact she is quite tyrannical (I wish they would dive more into her hypocrisy concerning 'giving people a choice, fearfully following her or death).
I do enjoy Jaime, Gendry (despite it feeling like fan-service for him to be in the show), The Hound (though he should be dead), Mormont (he should have disappeared into the horizon with ambiguity surrounding his fate), I loved Ned and Rob (I especially love how their honour, and their love killed them respectively, stupid decision get people killed!), Petyr Baelish, Roose Bolton (Ramsey was too comical at times for me), and a few other characters.
I just feel so disappointed. There was a time I was hooked but I feel like the show jumped the shark during season 5.