About your analysis...
I agree, Meagen is disgusting.
I don't think Reese is jealous. I think maybe he was at first, but not anymore. I don't like him that much anyway.
I agree about Ariel.
Whitney...she makes me laugh. So she's decent. And do you really think the things she has argued about were wrong? She was NICE to Ruth about the whole sanitary thing, IMO.
I don't think that Nick sees Kevan as a "threat" at all. I may be wrong (since I'm still not sure what the hell was going on in that episode), but I think that the only reason Nick told the group about Kevan not being Persian was because Meagan was talking about him. Nick was the one that was trying to make peace between Reese and Kevan, IIRC.
I don't think that your analysis is spot on at all. I think that you, too, are biased toward the Amish.