Well, I prefer the book format of things.
But don't get me wrong, I'm still enjoying the show (though I think this has been the worst season so far).
Regarding the Arya- Jon relationship, they did touch upon it this season in episode 4 I think it was when Arya has to throw Needle in the sea but decides not to. To me that perfectly encapsulated the relationship between the two. In fact when Jon was stabbed honest to god, that's one of the things I thought of.
Yeah, that was that moment the show-writers told us in the Inside the Episode feature that Needle for Arya was a symbol of revenge, and apparently not a reminder of Jon Snow's smile. I've mentioned it in the post above. The scene was well done though, props to Maisie for great acting.
And yeah, I understand the adaptation problems as well, but some of the decisions they do just make no sense. Why cut the Riverlands storyline for this Dorne nonsense? If you wanted to include Dorne, why cut Arianne, who is, in my opinion one of the most interesting characters there, do a total 180 on Ellaria's motives, reduce Doran's lines and screentime to a minimum (fire and blood speech, anyone?), and include over-the-top cartoonish Sand Snakes (to be fair, I hated them in the book too, so there's consistency)
In the interviews before this season (I think) they've said how they've spend a lot of money and time on making the Hall of Faces, making sure to make every of the six hundred faces unique. The Hall of Faces was featured in what, three scenes this season? And there's more stuff like that. But some decisions they make are good or even great, I mean, Hardhome fight wasn't shown in the books and I really liked it, so there's that.
The first season had a low budget, and it was great. Even the invented dialogue was mostly amazing, and the scenes with two actors D&D had to write to fill up the time for some episodes were great. Now we're getting "You want the good girl, but you need the bad pussy". Granted, the first book was the most adaptable of them all, and books 4 and 5 are the least adaptable, but my problem is not that they've cut a lot of filler (because as much as I like AFFC and ADWD, there is filler in them), but that they've substituted the book-filler with their own invented show-filler, and while they sure can write things, they're not as accomplished writers as GRRM is (again, all my opinion here). I think that's why this season ended up a bit on the weak side.
I will of course watch and enjoy the show further, but I really hope TWOW comes out before S6, even though there's like 1% chance for that.