My god never in all my days have I seen an actor get blown so far out of proportion. BB and TDK had so much needless grit shoveled into them that it became a god damned joke. Tragic as his death was, Ledger's Joker did not feel right. He just felt like some asshole psycho that lucks through life because nobody feels like shooting him, instead of a truly sinister mastermind, thats so unpredictable the worlds greatest detective can't even guess what he's going to do next. When I was watching Nicholson talk to Vicky Vale in the art gallery I had no idea what he was going to do. When Ledger was talking to Rachel at the fundraiser I knew he was going to take her hostage in some form, until Batman shows up, making him threaten to trow her off the building. Sure Batman never kills, but sureley a room full of crimelords would A, have had a gun happy guard somewhere in the building, or B, would have just shot the guy who just emptied one of your vaults in the face before he could pencil your goon in the eye.
I'd like to see Nolan or whoever does the next one have any villain that can be made realistic, ruling out Killer Croc, Man-bat and others like them, be played any differently. I honestly think Nolan is too busy drowning himself in gravel to think about things like this. The only villain that could possibly work is Riddler, this would aslo have Batman finally use some detective work solving them.