Spoilers from the finale yeah,
They really did mess up Tyrion's storyline there. Tyrion, towards the end of this part in his story, was supposed to have become a monster. He wasn't supposed to hug Jaime goodbye; Tyrion was supposed to be left feeling that he really has nothing, no family. His murdering of Shae was not supposed to be in self-defense and he was not supposed to say he was sorry after. He was supposed to find out the truth about Tysha and that should have been his reason to ultimately confront his father, and kill him. He was supposed to hit the absolute rock bottom.
Instead he got a nice huggy bye bye from his bro, had to kill Shae because otherwise she would've killed him omg! and only killed Tywin for general cuntness and allowing him to be sentenced to death. Now little TV Tyrion is bummed out, but not nearly the monster that he became in the books, and I'M DISAPPOINTED. "But shirenu, why would you want your favourite character to become a horrible monster, to the extent that a ton of book readers even grew to hate him towards the end of ADWD?" Because I have a hunch that his story in the books got to the lowest possible point because it makes it possible for him to rise back up again and have a truly satisfying ending to his story (whether he lives or dies). TV Tyrion is so fucking soft and sheltered, anything he does from now will just be continuation to his previous ~awesomeness~ with just some added melancholy from having killed Shae and Tywin. But he won't be a monster who will have to work hard to become respectable again, D&D won't allow it.
I really don't think D&D understand some of these characters very well sigh. Tyrion is not supposed to be always loved, all his actions are not supposed to be defensible. Tyrion is not supposed to be a perfect 'outsider' for the audience to bond with. He's supposed to sometimes FALL HARD, just like all other characters. But D&D have made him so flawless and neckbeard fantasy jerk off wank party -like that he will only keep drifting further and further away from the complex Tyrion I know and love from the books.
I'm also bummed for Peter Dinklage because he SO would have been AMAZING doing a monstrous Tyrion. Can you imagine if he had choked Shae out of bitterness and anger?? That would've been fucking epic. I was prepared to feel like shit (in a good way) after the finale, but instead I felt like... That's IT? Those scenes were supposed to fucking destroy me and they did not even come close. Fucking hell.
Like I don't even mind details being changed as long as the emotional impact is the same. But this was just meh.
So yup, that was a rant. I've been toying with the idea of no longer watching this show, but it's so fucking hyped that I'll probably be drawn in again. Siggghhhhhh