The Joker isn't a weak fighter, he's a street fighter and just not as adept a fighter as Batman. I find it believable that he wouldn't be able to physically take on Batman who is someone who has had years of martial arts training. The Joker will always manage to get some sort of hits in if he's weaponless, but will ultimately be beaten.
Ok so your telling if Joker had no weapon he could get a hit on Batman? No way he'd try to but he would own him like he did in the interrogation sceneI don't remember any story where he posed a physical threat to Batman, as far as fighting goes. If you know of one, please enlighten me.I'm not saying a direct hit or anything to stun Batman. My point is that he's not a true weakling as you all present him to be.
Eh, in the 1940 comics, he regularly beat the crap out of Batman, but my point is that he's a fighter, just not anywhere on Batman's level.
Must we forget the magic trick and the 20 year man?
How do you think he was able to get the knife to the officer's neck? Magic?

Jack's Joker might be physically closer to the Joker of the comics, but I think Ledger's Joker is closer character-wise. Which, in my opinion, is more important.

Again, strategy: first, he doesn't particularly care what Harvey does so long as he abandons his ideals in doing so. Second, Harvey is restrained (whether to keep him from escaping, or to keep him from harming himself is an open question): after the first couple of grabs, the Joker unfastens the restraints. By this point Harvey is listening to him anyway, and is still listening even when the Joker puts the gun in his hand.
Ledger's Joker is lean but not scrawny: he's more wiry. And he has really great arms. Let's face it as far as the legs go: that nurse outfit wouldn't flatter any guy's physique.

Did anyone else notice that the one and only time the Joker actually seems startled, and then only for a split second, occurs when the lights come on in the interrogation room? When Batman rounds the table, after he's slammed his head but before he slams his hand, the Joker's eyes open very wide. It might be the split second of realization that this isn't just the expected "bad cop" but it's the one and only time in the movie when he does react like this.
Do you think that if Two-Face turned out to be alive, he'd work with the Joker.
How much longer did you think I would let the Falcone family tear Gotham in half? Splitting this city between good and evil. My city.
i kinda like the idea of the joker telling his own origin, like in TDK, with his scars, such a story would make for great entertainment, the problem being we will never get an actor that could pull off this new kind of joker, like we had with the late Heath Ledger.