I must say that Erin Brockovich really has a potty mouth; she's an appropriate dresser, and an unemployed single mother. These might not be attractive aspects for most of people, and some people might say that these are her negative characteristics. At least for me, these are not weaknesses, not even close. These are her most unique traits, and I love them.
I think that her problem is her emotional attitude. She's lost so many things because of it. For example, she failed her job interviews, and even at the court she loses. She can't help herself from yelling and can't control herself. These are her main weaknesses.
On the other hand, her strong will faith are her most epic strengths. When she has to choose between her job and the stupid boyfriend (well... he is sweet but still...), she makes the right choice. She always knows what she has to do because she believes in herself.
BTW
"Bite my ass, krispy kreme."
"Two wrong feet in fucking ugly shoes."
"I just went out there and performed sexual favors, six hundred and thirty four blow jobs in five days."
These are my favorite. ha-ha.