Logic/Details - » Now I think I understand the picture. This season, Lost producers decided to reveal crucial information about some of our favorites characters, that may be shocking, regarding Locke, Sun and even Jack. Information about some action they had taken in the past. This is exactly what happens with Sun flashbacks here.
It make all the sense in the world shift the focus to Sayid, Sun and Jin. Like the last episode, this could be dangerous because of all the hype, but the producers take their chances. After all, this show is about you being "Lost" and revealing little by little, exploring the depths, and not about instant gratification. Speaking of, this episode can easily can compared with "Adrift", but this time, the producers did their homework.
Had the episode focused entirely on Jin and Sun, it would not have worked very well.
Progress -» As usual, is all about information on Sayid, Jin and Sun, even Sawyer got some information from the Other. The end is informative too. This episode contains enough information to keep anyone satisfied for now.
Emotions/Stimulation/Highlights -» This episode contains various good scenes. From knowing the truth about Sun affair, to the unexpected suicide of Jae, Ben and Jack interaction, Sawyer and his little plan. Overall is all about tension, knowing the truth and some nice surprises on the way. The best Scenes were when Jin was looking for Sun in the sea and when Ben talks to Jack.
Ending - » Exactly the type of ending expected from a Show like LosT.
Overall - » You have here a better episode than the season premiere, that don´t make the mistake to only focus on Sun and Jin. Also there are great scenes to see and this Time Sun and Jin have their best Flashback to date. The end is exactly what Lost producers can deliver.