Did you bitches cry this hard when they left Tom Bombadil out of the Lord of the Rings movies?
As I've said time and time again, it's an ADAPTATION. If it were exactly like the books, you wouldn't watch it because you would know every little thing that was going to happen. Some stuff doesn't translate well to the screen. And this is being produced for a pay-channel network, so the sex scenes have to be three-fold.
"Some stuff doesn't translate well to the screen" sounds like a cop out and you don't know what you're talking about.
Robb transforming from a man of character, who tries to live up to his father's name and his family's honor into a desperate teen hankering for love is awful. It ruins the character and all of his development. Bubububu Tom Bombadil? Really? Who ultimately isn't that important in the LOTR books or lore beyond the fact that he's a god?
Arya, Hot Pie, and Gendry literally walk outside of gates of Harenhall. There WERE guards. But they were dead already. IT'S AN ADPATATION, he says. No, all they had to do was have one guard, just like in the book, have Arya tell Gendry and Hot Pie to shut the fuck up and stay here, take the dagger she stole (since Bolton isn't in Harenhall, let's just say it's just a random dagger for protection) and then shove it up the git's gut. It would have taken the SAME AMOUNT OF TIME and would have developed her character while doing so. Waltzing out of Harenhall? What kind of person is Arya at the end of season? Oh, just the exact same as she was at the beginning of season 2 and not the survivalist that Arya eventually needs to become. But, OH NO, he says, it's an ADAPTATION!

In the book Dany's dragons aren't taken at all. Pyat Pree invites her to the house of the undying, and she has guts. She's not some prim delicate rose. She has her dragons too. What does she do? She walks to the house of undying's doors, willingly, to take him on his offer. He drugs her, and she burns the fuck out of every single mother fucking wizard in that city. No bitching, no mewling about WHERE'S MY DRAGONS. That segment of Dany's part of season 2 was objectively awful. ADAPTATION!

Jon Snow ranges with Qhorin Halfhand and a host of ranger pros. He scales a mountain with only his hands and feet in bittering cold, he kills a Warg (how has the show not even mentioned what a warg is yet?), and then goes for Ygritte and lets her go. He finds Halfhand and the rest, they're laid into a trap as each individual members dies one after one. Halfhand and Jon eventually range through a cave, knowing they are like to die, with the warg's eagle following them. Halfhand clearly tells Jon to kill him in a ruse to gain the wildlings' trust, and to study them, follow them, fight with them until it's safe to escape. Tension, world building, character development, great fights, and suspense. Jon's chapters had all of these things. What is it like in season 2 of GoT? Oh, he gets lost, Ghost gets lost, Ygritte makes a bunch of jokes about him being a virgin, Halfhand is a fucking idiot, it's boring. They spent at least 10 episodes building Jon's trek beyond wall I think and it was still shit. ADAPTATION.
When adapting, changes are going to be necessary. But when there are unnecessary changes made to the characters and their quest, it makes one wonder what direction they're taking the adaptation in. In GoT's case, things just aren't looking good as far as resolution goes. Since you mentioned LOTR, let's say instead of being best friends, Sam and Frodo are actually lovers. Why? WE DON'T KNOW. That's a GoT season 2 level change. BUBUBU ADAPTATION. These aren't complaints that "THIS WASN'T IN THE BOOK", these are complaints that "haha holy shit, these changes are terribly written, what is this, the sy fy channel?" While it's true GoT tv is pushing the boundaries of information one tv show can hold at once, none of these changes were necessary and they all stink of bad writing. Period.