I thought it was good, but not great. It fucked with Batman canon, and I thought the death of T&M Wayne was a lazy inclusion. It also thought the only way something could be dramatic is if it blared string bass notes at you.
Is was good film though, and your boy Joaquin did great (although I didn't like his laugh).
It suffered from the same problem as a lot of "supervillain origin stories", in that it ruins the supervillain. Knowing why the Joker is evil takes away from his evilness somewhat.
I did like the fact that the first time we saw Bruce he slid down a pole, though