Not really my style, but...
It definately has something to work wth there.
I think it's a bit slow, but that's me, and there's a lot of hits in there, not necessarially a bad thing, it just overwhelms you a bit, as do those rising Brass Crescendos - not to mention that they are a bit painful when wearing headphones...
There seems to be some clipping around 2:20 as well.
The bells, though,, seemed a bit out of place.
It's definately dark, and it works for a "Joker" themed song - i assume from batman, if so, you hit the feeling about right.