I was actually fine with Joker killing off Rachel, just so we could get rid of Holmes in case she returned. But since the role's recast, and we got a more competent actress, I'm not so sure anymore. Still wouldn't cry if she's cut short in TDK however. Much more interested in Selina.
LOL. That's sad, actually. You wanted Rachel killed off because you didn't like the actress, and now you're not sure. I love how what's best for the STORY never entered into your thought process.
Scarring Harvey takes him out as an ally no matter what. I never said THAT was predictable, just that Batman's #1 nemesis just so happens to create Batman's #2 nemesis.
Ahh, so we're back to that. Two-Face is Batman's #2 nemesis? I'm pretty sure that by definition, a hero can have only ONE nemesis. Everybody else is just a villain. Joker is Batman's nemesis. Two-Face may be considered the #2 villain, but the fact is, Two-Face has only been done ONCE in live-action. Joker, Penguin, Catwoman, Riddler have all been done multiple times. Since BF, more people probably know who Two-Face is, but if you ask the average joe to name a Batman villain other than Joker, you're going to get more Penguins, Riddlers, and Catwomen than anything else.
So Two-Face may be #2 according to fans, but to the rest of the world (which is a much larger number of people) he's probably #5 or so.

Personally I'm not looking at Two-Face as being the most interesting villain, because he's actually one of my least-favorite villains. I'm looking at him more as a character who has a lot of potential (he does) and can be used in interesting ways. I'm not interested in having the #1 Bat-villain creating the #2 Bat-villain. I'm interested in having Batman's nemesis turn one of Batman's allies into an enemy. Why? Because it's more interesting to me.
You made it sound that way, at least.
I think having someone as second-tier as Maroni scarring Dent adds to the whole escalation just as well. You're right, Joker is creating all this havoc and causes a huge toll to Bruce. But say, at the end of the film, when Joker is in custody, at the moment we're expecting a conclusive ending...something ELSE (the scarring) happens that completely interrupts the short-lived relief of stopping Joker? It adds to the conundrum presented for Bruce, that even though he's stopped one of his most fearsome villains, his job is never done. There's always more people out there causing trouble. That's just as good imo.
It may be just as good, but it still requires adding an additional character into the plot for no other purpose than to scar Harvey, which seems like a waste.
Again, there are still many ways they can go about, to lead up to this moment. You say the Joker being the main ingredient to set this off is the best take, I personally think there are equally good alternatives.
That's a fair and balanced statement, a true statement, and one that I have no problems with.
Couldn't get a shot off on that one?

t:
Joe Chill.
Again, Joe Chill.
And your point? Have I ever badmouthed BATMAN '89? It's not my favorite Batman movie anymore, but until Begins came along it certainly was, and it remains my second-favorite Batman movie, and one that will always have a special place in my heart.
So what exactly is your point???
Why do it? To create some purpose for the character, instead of making him 2-d. You do realize this was done many times in BB don't you?
Sure, characters were altered to fit into the plot. Ra's, Scarecrow, Falcone, etc. The funny thing is, that works just as well as an argument for why Joker can scar Harvey, as it does for your case. After all, it basically says that departures from canon are okay. Right?
Not exactly minor things you just gloss over. Everything Ra's taught Bruce, Bruce used to create Batman. Using fear as a weapon, theatricality, deception, etc. etc.
So what? Bruce learned those things from SOMEBODY in the comics, right?
Besides, the movie never taught us where Bruce learned criminology, or if he did at all - but the fact that it isn't mentioned doesn't mean it didn't happen. How about Batman's belief in the basic goodness in people? The idea that people can be inspired to do the right thing if someone sets a good example? That's central to Batman and he learned that from his Dad, and from Rachel.
Not to mention the fact that his Dad also talked about "all creatures feel fear... especially the scary ones." Which is just another way of saying that bad guys are a superstitious and cowardly lot. When Bruce went to Ra's, he specifically told him, "I seek the means to fight inustice. To turn fear against those who prey on the fearful."
Ra's didn't create Batman. He just helped Bruce get there.