I hated Batman. I hated Gordon. Joker was fine but everyone went crazy over him only because Ledger died. I barely remember the other characters (granted I have seen it exactly once and that was eight years ago, but still). And _ender raises good points as well.
Gary Oldman was probably my favorite Gordon so far, but I can dig it. I also thought that the film’s mytique was in a way boosted by Ledger’s untimely death, as morbid as that is.
As far as _ender’s points, they all make perfect sense. I guess for me, that characterization of the Joker kind of fit his personality found in the comics, so it wasn’t as much of a turn off.