Most annoying character
I thought SJP's character was the most irritating and unlikeable person in the entire film. From the board topics, it seems like most people had problems with the family, but I thought their quirks actually made them relatable and interesting. SJP's character on the other hand had no redeeming qualities (other than good taste in Christmas gifts.) The entire time she was onscreen I just wanted to gauge my eyes and eardrums out.
This movie would have been so much better if they'd tweaked that character a bit; or perhaps cast an actress who could have made the character likeable.