Jennifer Aniston is a terrible actress. She does not convey emotion well. She has the same blank look on her face often. What she does do is use her hands non-stop. She holds them up to show she is frazzled. She waves them around to show she is angry. She holds them palms skyward to show confusion. She is awful. Can't Hollywood see that we don't care for her as a person or if she gets the guy? Usually, the other female choice is the better, motionless arm one in the love triangle.
One exception being her acting performance in "She's the One". That was also some of Cameron Diaz' best work.