When I first saw Karen Gillan on DW, I was unimpressed with her acting skills. It's like she had only two facial expressions: wide-eyed, and wide-eyed and pouty. But she definitely got better as the series went on. She was actually very good in "The Impossible Astronaut". I'm interested to see how she does in "Guardians".
She can't be any worse than January Jones as Emma Frost. *gags*