I know Im way behind all this, but watched Batman begins in the week and The Dark Knight tonight and it they are incredible! amazing films well lived up to all the hype.
I still find it interesting...
Batman Begins, did quit well in the cinema but has done better on dvd and hd. But sooo many people did not go to see it because of the previous film which made a total joke of the whole thing and it was sad to see the first with Keaton, followed by a good squeal and then ripped apart as mentioned. But a lot of people like yourself would and do like it when they see it.
I think why people laugh is because they think the Joker is supposed to be funny and while he is doing sadistic stuff it is in a dark funny way but I think the girls etc overly laughing do not understand the dark undertones and just actually how smart the Joker is.
I think for me Heath did a good job being dark and evil and a good Joker but more over he did a better job showing how madness and smartness are both closer then you think and a fine line. It was only his perception of how bad Gothum had become and the same mistake Raaz made in the first movie and again that hidden extra level to the movie again showing Gothum could and can be saved.
As Alfred said, things will always get worse before they get better.