Don't get me wrong, most of the episode is actually pretty cool, especially the scenes with Deke and May but there is something distractingly wrong going on here.
When Mack knocks Virgil unconscious he sarcastically apologizes that he 'saw a dirty-looking dude, standing over you with a creepy looking weapon, I reacted'. If Virgil had a weapon, in wasn't aimed at Coulson. Virgil was dirty but you could tell in 2/10's of a second that he was friendly. And obviously if he had been in any danger Coulson could have taken the guy out no problem so why does Mack say the guy was 'standing over him' at all? These are assumptions, not reactions. You tend to react to things that are actually in front of your face, things that are actually there no matter how you feel about them. Mack doesn't' react, he doesn't' take the time to read a situation, or people. He just goes with whatever he thinks is going on, and follows his own assumptions, how HE feels about people.
Coulson is his normal, patient, dry-witted humor self. Yo-Yo and Simmons play off each-other beautifully. But seriously you could have called this episode 'harbinger' and been closer to the point. As in a Harbinger of bad things to come rather than people getting oriented to thier knew surroundings. Mack's erroneous, sanctimonious attitude will not only put distance between himself and those members of the team he is closest too, it drowns out what virtues, heart and even internal conflict the other characters bring to the table/show. His attitude of 'we won't become like them; we won't lose our humanity' with no sympathy or understanding of the fact that having as much humanity as these people have after living like this for so long is impressive. The only character who professes their Christian faith, other than Yo-Yo, not only doesn't live up to it has judgment on the quickest speed-dial. It's...disturbing actually.
This episode was the beginning of the End.