Maybe most of the theatrical elements were too deep for you.
At least the
professional critics
caught on.
There are so many intricacies....foreshadowing, symbolism....I loved, for example, how Harvey's luck came from a two-headed coin, showing that he controlled his own luck. Then, after the explosion, half the coin blackened, and, likewise, he became a man of chaos.
The Joker, despite being a crazed lunatic, actually had a method to his madness, and saw beauty in peoples' true colors. This made for an even nicer twist when his expectations weren't met with the ferries he set up.
The movie really felt that the tighter the good guys tried to grip gotham, the more out-of-control things became, which added an overwhelming sense of helplessness and panic. And here I didn't expect the Joker to be anyone special...