This episode gets kudos first and foremost for hiring Bryan Anderson to play the amputee at the end. His acting brought tears to my eyes. I really would love to see Bryan Anderson's character come back on the show, as he's an AMAZING actor and it's great to see an amputee playing an amputee. I'm sick of Hollywood casting able-bodied actors to play disabled characters.
This episode also gets kudos for making the most visible (and frankly, most scary, psychopathic) terrorists white kids in their 20s. It's very easy to fall back on making the terrorists brown Middle Eastern people, something most shows are guilty of at some point--including H50 in this episode, though they have very little screen time.
This episode gets criticism for two things. First of all, one of the terrorists is female and she shows off way too much skin to be a Muslim extremist (who usually follow the most conservative rules of Islam, one of which is to not show excess skin).
Second of all, the writing for the scenes in the interrogation room felt very stereotypical and outrageous to me.