Rachel being a moral compass, that's Alfred's job. Gordon's job. Robin's job. They all bring Bruce back into focus when he gets too close to the edge, or loses sight of something.
And in BB, it was Rachel's job as well. If you don't like that decision, that's one thing. But it doesn't diminish what she was
in that story just because someone feels that it should've been someone else. If that's the case, then Gordon should be viewed as 'weak' as well.
Corny lines like "It's not who you are underneath, but what you do that defines you" just felt shallow and forced.
Was it any more corny than "Why do we fall....", originally coined by that insignificant father character?
There was no chemistry between Bruce and Rachel. There was nothing there to imply they felt anything more than a friendship. It's one of the reasons why the romantic thing at the end felt so out of place, forced, and false.
There wasn't time for that kind of 'chemistry' in the story and with what was going on until the end. And again, it wasn't meant to be that kind of romantic interplay throughout. Looking at that story, how could more romance along the way have helped? Was their friendship alone not enough to warrant his saving her from Scarecrow the way he did? Should he have tried to kiss her at the subway stop after taking out those muggers?
Rachel is going to be one of the most easily replaceable characters ever. You won't see many people missing her. Count on it. Nobody gave a damn when she died in TDK. Most people are glad, because now a REAL love interest and stronger female lead can be brought in.
I'm not saying people will miss her. If anything, it speaks more to people expecting something more hot n' heavy, or a femme fatale, but not getting it. Understandable, but what they got was a story that in which a character like Rachel, and her significance to Wayne, was better suited for. That may not make her as exciting or as memorable as a Catwoman or Talia...but it doesn't make her weak. She was as 'REAL' of a love interest as there can be. If people are looking for more sexual tension/flirting, loosely referred to as 'love interest', that's something else. Perhaps Rachel was too mature and realistic of a love interest character for some....which again, is understandable from a certain perspective and more about the movie as a whole. But it still doesn't make her weak.
While I think Maggie is a much better actress than Katie, I think it's more down to the material rather than the casting. Not many actresses could do much with such a bland, uninteresting character.
Especially if the viewer already wanted a Catwoman, a blonde bombshell, or what have you instead.
I think she was more pivotal in TDK, but as a plot device for Bruce and Harvey. The character itself was still bleh.
What love interest of any degree...or other supporting character...
isn't a plot device? Rachel's character fit the kind of story that Nolan was specifically telling with those movies better than a Catwoman or whoever would have. True, it didn't quite fulfill a sense of token wildness and infatuation that a more comic-like presentation may...but such can be said about a lot of interpretations for those Batman movies. Collectively, everything pretty much fit together well. So if you want more swooning, then hopefully you'll get a movie and story that will be more appropriate for it. Othewise, you run the danger of injecting it for the sake of conformity and plasticity...which really would make it weak.