I don't hate Monroe as much as a lot of people do, but I do have to admit that Neville would be a much more interesting Big Bad.
As for the episode, I thought it was pretty good. It was interesting seeing Miles & Rachel back when he was still with the the Republic.
I was shocked when Rachel didn't help the kid, but I think it really was the smart move. On top of what she said, it would probably create a pretty bad situation for her and Aaron. If word got out about what she did, then they would probably end up with tons of people after them.