I thought Heath slipped into character more, but Jacks Joker was FAR better, IMO. I don't think TDK-Joker brought anything groundbreaking or "new" to the table, in fact, it diminished on what we already know about the character. The only "wild card" in TDK, was that we didn't have a back-story for The Joker. Other then that, it was trying to live up to what the character embodies, and fell far short from what makes The Joker-Joker. There wasn't anything "trademark", that told us this was THE Joker, other then his purple suit and vague, drugstore make-up. The Joker we all know and love, is perma-white, and uses a slew of nifty Joker gadgets, to not only overcome his opponents, but to make a gag out of killing people.
In most stories that has The Joker, regardless if it's cheese or serious, we would always see Joker psych out his victims by making them think they were about to die with these gadgets, only to have them become a huge joke, making light of the situation, and catching the victims off guard, right before he went ahead and went by his true motives(to kill). This was never truly represented in TDK, and a HUGE reason to why I think TDK-version took away from the basic core of the character. The Joker is a killing trickster, and finds his gadgets to be truley funny, and helps represent his truly psychotic side, although, TDK-version didn't really represent this at all.
Joker gadgets are basically his tools of destruction, or I should say, his weapons to combat against 'ol Batsy, while also having a laugh to his foes and random victims. His gadgets, are what makes the character stand out the most, and what truly represents him as a whole. I would say they represent The Joker, just as much as Batarangs, grapple guns, and The Batmobile represent Batman. TDK, not only failed to come up with anything new, they took away from what we all know and love. Instead, TDK gave The Joker regular guns, knives, grenades, and bazookas. Now, The Joker could, and has used, these weapons in past comics and cartoons, but to make it his only tool of destruction, is a lackluster attempt to ground the character in a more "realistic" environment. Any villain could use the weapons, but they should only be used in the mix of his stylized gadgets. I was never asking for TDk to come out with the same-old-same-old Joker gadgets(joy buzzer, Joker venom, etc), but to fail in not coming up with anything original for the character, other then real world, terrorist-weapons, was such a disservice to what the character is all about.
If TDK-Joker actually had some signature weapons at his disposal, then I could probably overlook the non-perma-white skin. But, seeing as how that was already a let down, on top of The Jokers arsenal, makes me think this is one of the worst versions/representations of the character to date. Sure, the dynamics between Joker and Batman wasn't half bad, but it's hard to even think what I'm watching on the screen is The Joker to begin with, as his "masterplan" could have been pulled off by any of Batmans villains(ie. Riddler, Penguin, Catwomen, Two-Face, etc). It felt more like Osama Bin Joker, then the actual Joker! Again, Heath did an AMAZING job at slipping into the character, but the character itself wasn't written properly to make me believe that they brought anything new to the table, when in my opinion, they took away so much more. While Nicholson didn't slip into character more, at least his version felt more true to the source material. I wanted a more serious version of The Joker, but I wanted them to remember what truley defines the character, and once again, I think TDK fell far short of the mark.