Admittedly, what I tend to remember most about this episode is the fact that the writers Went There with the muppet sex. I shudder to think what that says about me.
The Farscape Wiki has a summary here.
But seriously: Muppet sex aside, Fractures is but a passable transition story. The writers do close one chapter and open another in a reasonably competent fashion, but there's nothing here that's earth-shattering -- nothing here that really fires the blood.
The strongest scenes of the episode are those which revolve around Moya!John and Aeryn and the new awkwardness which exists in their relationship. This is mainly owing to the fact that Ben and Claudia are talented actors -- though kicker lines like "It's irridium alloy; of course it'll hold -- just like the Budong" and "Now she thinks you're the copy" also help a great deal. It's especially interesting to watch the emotions that play over Ben's face as John tries to reconnect with Aeryn. You can really feel that John is hurt by Aeryn's cold and distant demeanor. He's been pining for Aeryn all along, and now he feels like he's losing her again.
Beyond John and Aeryn, though? Meh. I don't really have anything profound to say, I'm afraid.
I'm adding an extra half point to the average for the realistic way in which the writers handle John and Aeryn's reunion.
Claudia Black and Ben Browder are pretty strong here, but the rest of the performances are only okay.