I actually like it,it's like when she cut it she took a step to the adult world,when she had a long hair she was still a girl,and Emma will look beautiful in anything.
I like Emma mainly from Harry Potter for the perfect way she portrayed my dear Hermione's character. Other than that,I like her for her smart and friendly nature. So I was not really fussed when she got this hair-cut.
But I agree that its NOT one of her best choices.