Sick means cool or awesome now.
No one wants to talk about Inglorious Basterds?
My take on it-
This movie comes off as a fun loving Nazi killing movie on the surface, but in my opinion, sensationalizes the persecution of a group of people (insert any group) southern lynch mob style. It makes the viewer come away enjoying the experience, which in fact makes me question what I saw & felt. Much like Dirty Harry where one administers their own "brand" of justice.
The problem here, at least with me is, they administer it to regular German soldiers, not just SS, then they have no problem letting the nemesis & Jew Hunter walk away. To me this was the irony in the movie.
I'm not sure what the intention is with Tarintino, but certainly made me question my morals after watching it, much like I did after seeing Pulp Fiction.