Regarding the "Jim Gordon, he's a friend. Try to be nice" line. It wasn't the line that bothered me, but the delivery. In context with the way she speaks throughout the rest of the movie, I would dump a girl long before she had a chance to dump me.
Regarding her standing up to The Joker, I'm not surprised that she did, she spent the entire movie standing up to everyone, even when they werent being combative at all. I cant see how you can watch the movie and not see that she takes on most of her conversations with an "Im in charge of this" attitude.
Regarding her knowing the case...I actually believe she says "briefs", as in court briefs...thats really just which one of us heard the wrong word, and not worth debating.
I've already laid this out...but Maggies Rachel takes virtually every scene she is in and attempts to argue with those around her, or in some way manipulate them, including when her best friend gave a public speech praising her boyfriend.
But my complaint isn't that she does it, it's that that isnt how the character was established.
I will say that there are a few points in begins where it can be argued that Katies rachel acted like maggies. That being when she slapped Bruce, when she stood up to the bad guys at the end, and when she told Bruce off about it being what he does that defines him. She wants to help save Gotham, but her actions (and Katies portrayal) show a girl that is pretty sure that she isnt capable of doing it. Katie may very well be a horrible actress, but it fits the character because the character is unsure of herself when she says what she thinks should be said.
So...Rachel...as established prior to the start of The Dark Knight:
She dates every boss she has in the films. Why? Because she subconsciously needs that power. She wants to be that strong, but isnt.
Has an inferiority complex. She is well established as being a talented member of the department, yet when the DA position comes available, and she seems to be the person to inheret the job, she doesnt even try to get it. She simply endorses another person. She knows that she isnt talented enough or strong willed enough to handle the job. Thats what people do when they subconsciously feel that they arent good enough for a promotion.
Acts tough, but isnt. She slaps Bruce in the car, she stands up to the crooks at the end of Begins. However, in both cases, we all felt that the character was just going through the motions...and in fact, she is. She knows she isnt that strong. We get that in the portrayal, yet many here dismiss that as bad acting (when in fact it is showing levels of a character without even speaking).
She has very conflicted feelings for Bruce, and cant quite sort them out.
Overall, up until the moment TDK starts, the character is basically a little girl playing a grown ups game, and is well aware that is out of her league. This is even evident in Maggies campaign virals.
Now...lets start TDK:
Maggie mouths off about how well she knows the case. Well, she should know the case...shes still an ASSISTANT who does a lot of the drudge work. Whats with the attitude? If you were good enough to be DA, then you would be.
Maggie mouths off about how to treat Gordon. What was with that delivery? Gordon isnt a friend...he's one of the few allies you have on earth. Instead of the delivery conveying that, it instead talks down to harvey like a child.
She talked tough to Lau, but went to Harvey for backup. This is actually what katie would have done, except the delivery of the lines is not in keeping with the character. For all that tough talk, she didnt think of RICO (and I did and know virtually nothing about law).
When eating dinner with harvey and Bruce...she did what katie would have done...she kept her mouth shut and let the two talented people talk. This was due to the script, and Maggie had little effect over the scene. She ven became subservient to the prima ballerina, for what reasons? Its obvious why Katies character would...but its completely out of character for Maggies...this scene flies in the face of Maggies portrayal.
She argues with Bruce over the fact that he praised harvey. Um, he praised your boyfriend and raised millions of dollars for his next campaign. Shut up!
Her answer for Harvey is "no answer". This comes off as manipulation...as does her later manipulation of Bruce. She was angry when he says hes going to turn himself in, then shes angry when he doesnt. She goes to harvey and starts complaining to him about his decision. There is a good long stretch in the movie where she does nothing but complain about not having her way, even contradicting herself in the process. This is mostly due to her delievery.
Even during the scene where her and Harvey are trapped...she takes control and starts telling Harvey what to do. Um...hows that work out for her?
In most cases I dont think that Rachel is written too terribly different from how Katie established the character, but the delivery of the lines completely altered the character. Katies rachel has unspoken depth, whereas Maggies Rachel has no depth, because all of her lines and actions are delivered in a very one dimensional way. Katie Holmes is not a good actress, but I feel that given the exact same script, she would have given the character the nuassance of being unsure of herself, where maggies rachel is completely sure of herself, even when she changes her opinion on a dime.