Oh yeah, this was a pretty cool episode. The flashbacks fleshing out life in the town before the beginning of the series were interesting, we learned rather surprising twist about Mayor Nikki. Doctor Yuwell just became ten times more interesting than before. And finally, the scene where Datak pulls his energy blade on Rafe, but Rafe just reveals his gun is a defining moment of awesome for both characters. Hell, we even get what some fans longed to see on Enterprise, an alien (in Enterprise, Shran, in Defiance, Datak) calling a human with darker skin a "pink skin" and that human pointing out their darker pigmentation.
Yeah, this was a pretty solid episode. Great character moments, backstories fleshed out, significant plot developments. It's got it all.