FUCK MAN, I KNEW IT. I - KNEW - IT.
I was sensing someone would die, it was very blatant, and it had to be Robb. There was a DEAD giveaway earlier in the season, when one of them said about marrying his wife that he had lost the war when he did. The way that comment was so painstakingly focused on in the shot and that scene, I knew once the problems started to arise that it was going to be Robb. I did expect that Catelyn would survive and obviously Arya would.
Most of all, I'm really bummed a storyline just ended the way it did. It was just... so out of the blue. I am not sure I felt it was more shocking than Ned's death, because at the time of Ned's death I was stunned to see a top character go. By now, I was expecting it.