I would give Joker an 8/10.

My most memorable scene would be the scene when Arthur walks away from after the police get beaten at the train station. The way he so nonchalantly walks away and the slow the clip down with such dramatic music over the top. scene like this are normally seen when a hero walks away from an explosion or a collapsing building carrying a civilian. this contrast between Joker and a hero highlights the decline of his sanity and the anarchy in which the joker represents.