Rake 
Just discovered this series the other week and it's fucking brilliant. Just about every character is a filthy bastard, or a lunatic, or both.

It's consistently one of the most hilarious shows ever.
Example:
"What's your success rate in court?"
"51%"
"That doesn't sound very impressive."
"It sounds a lot better when you realise that 99% of my clients are guilty."
And a bit later:
"I want you to be my barrister. Since we've already had sex, I know you can get me off."
Devious, treacherous, murderous, neanderthal, sub-human of the West.