Summary: Rachel's sister Jill arrives at Rachel's apartment because her dad cut her off. Rachel tries to help her but is shaken when Phoebe reports that Jill and Ross seem to have a spark. Joey starts giving away free food, drawing Gunther's ire. Monica is sick but refuses to acknowledge it.
The Good: Jill is played well and her role in the story is fun. I especially liked Rachel's reactions to a potential Jill/Ross relationship, and the idea that her interference is what caused the relationship is pretty clever. Ross, Phoebe, Chandler and Monica have the odd funny line throughout the episode. Though his story is a little flat, Joey is consistently funny throughout.
The Bad: This episode really feels like a part 1. The main story moves glacially slow and the two side stories don't really have much to them. The show continues to be very unoriginal with its storytelling. The Monica and Chandler plot is awful and Monica somehow gets more and more cartoonish by the episode.
Best Moment: I'll go with the confused looks everyone gives when they hear a knock on the door, realizing that everyone is already there.
Character of the Episode: Rachel.
Conclusion: This episode was fine for a few laughs, though the side stories were forgettable. It's also hurt by being a part 1 of a two-part story.
Just a university student who loves to watch TV. And criticize it like hell.