I shouldn't criticise the show's writers, because they did a wonderful job, with an incredibly solid and addictive plot and some of the best characters and dialogues of the last decade.
That said we have to admit that the last tac team search scene was highly unrealistic: one man goes in alone, finds a place with no one in, calls for help but the radio doesn't work, but magically out of nowhere Nazir appears and kills the soldier. This is some B movie, very disappointing screenplay.
I was ready to rate this episode 4, after that scene. But then Damian Lewis proved once again how huge an actor he his. First reacting from hearing of Nazir's death and then saying his goodbyes in the car, with Morena Baccarin giving one of her best performances from the begining of the show (excluding when she's naked).