series finale

Now what - that's what many people are thinking after the Game of Thrones Finale last night. What other shows have left you feeling a little empty/confused/sad after their series finale?

My Twitter-verse is still riff with complaints about the ending of How I Met You Mother, especially since the creators of the show recently announced they would allow fans to see the alternate ending they had filmed to the show. I've also seen a ton of lists about the worst series finales ever, and I'm kinda tired of them...