Stupid writing. The lighting was so bad that for more than 35 minutes all I could see on my phone screen was the reflection of my own face. I could go on and on about why the writing was stupid (dothraki, crypts, bran, Jorah saves Dany, etc) but the ending was so bad that my eyes bled.
These writers think that the show is all about subverting expectations. No one expected Ned to die but he did. He died because there was a reason and not because they wanted a gotcha moment. The arya kills NK scene was so stupid and all they had to say was - subverting your expectations lol.