I've never been more disappointed in a television show than I have for this season of Game of Thrones. While there were a few highlights the season was plagued with sloppy writing and horrible treatment of characters, resulting in what every one just witnessed last night. The only thing comparable I can think of is Lost, but at least I will give Lost some credit in that I don't think there was ever a master plan, they certainly had to deal with the writer's strike of 2008.
I'm not even here to complain about the fates of the individual characters, in fact, a lot of it actually made sense to me. The problem is the writing is so horrid that it never takes the characters from where they are at the end of the sack of King's Landing, to where they end up after the council meeting. Most notably Grey Worm and Tyrion the situation there is dealt with horribly, and the fact that Jon's family never mentions his heritage.
Because we don't know what Martin had planned, although we can guess due to both the direction the books were heading and differences already drawn out, and because of things Martin himself has said, it's very hard for me to judge this ending too harshly. The endings of the main characters may very well indeed be what Martin intended, and as I said I don't really have a problem with that part of it. The biggest issue to me is the sloppy ending makes the conclusion look sloppy. I think there were better ways to write the ending that they wanted, and they certainly could have left out plot points that were pointless and served no purpose.
I was talking with a friend at work saying how absolutely terrible it was for D&D to want to be done with this so they can go write some terrible Star Wars spinoff that no one is really asking for. They were given something that will go down as one of the most unique and fascinating looks of the fantasy genre. What Tolkein set precedence for and had been copied ad infinitum Martin reinvented and these two clowns just took it and flushed it down the toilet. There were many great and amazing things with GoT but it's going to be hard for me to remember the amazing parts without remembering the dumpster fire we saw last night.