Stuart Wilson does a impressive job as Marek, the psychotic leader of the Outsiders. Yes, scenery is chewed... but he's having fun with it.
And with a nod to the "bad accents" thread, his American is pretty passable.
The only weak link is Kevin Dillon for two reasons.
1: He sucks.
2: He will always be Matt Dillon's little brother... but Matt gets a shout out for doing my oldest sister in high school before he "broke out".