We finally get answers to many questions via Reese's extensive flashbacks (to his final CIA mission) and the final scene--which I (along with many others, no doubt) predicted back in Ep 13 (Root Cause). In fact, the opening scene and the final scene serve as great bookends. The opening scene instantly grabs hold of you, setting an urgency for the flashbacks. (The down side is, while we get the full flashback of the mission from Reese's point of view, the opening scene still remains unresolved outside of dialogue from Ep 1--this of course, sets the stage for what will be Reese's final flashbacks to 2010, likely delivered over the remaining episodes of the season.) As far as the ending goes, if this were a movie series, the final scene is so good, so long-awaited, that it would've been put as a after-credits "surprise" scene for die-hard fans. Even if you've predicted something all along, the way it's revealed in the way the scene plays out is still a surprise. Also, watch carefully for a few obvious and a couple if-you-blink-you'll-miss-it clues (hint: unless you speak Chinese, watch the subtitled dialogue) to connections between Reese's and Finch's backstories and their present-day in-the-background concerns.
In the fan goodies dept, watch the intro sequence for a conspicuous change--Carter's clip is no longer paired with the "hunted by the authorities" line--instead, her clip occurs offset from the line, and the line is now paired with a very appropriate clip from the climactic moment of Ep 10 (Number Crunch). Also, a Fusco clip has been added to the montage--which fits, since there are four leads, after all, and which should also make his scenes in this episode a bit less tense for his fans, as such a change implies that his character is not next on the "to-remove" list.
The episode does begin to shade in some hues of the key character differences between Carter and Fusco, as Joss is the one with her "moral compass pointed in the right direction," whereas Lionel is "loyal" (to borrow Reese's previous assessments of them both). Carter still squirms and struggles with rule-bending, which is to her credit as it shows her integrity, while Fusco (even as a "good guy") still is used to an "end justifies the means" mentality, which proves to be a good thing for Reese in the moment, but may be something he'll later regret demonstrating around his son. Since Jonathan Nolan loves playing with these dynamics and viewpoints, it makes the interplay and individual personalities among the four leads that much more enjoyable to watch, and that much worthy of discussion after.
The only viewers likely to have any disappointment in this episode are those who enjoy the individual POI stories over the bigger storyline. The focal point of the episode is the bigger storyline, as it's the lead-in after the final break to the final episodes. The POI story in this case functions more as a means of underscoring and facilitating the other things going on; while that may seem contrived to some, it makes sense in a real-world perspective if you think about it--after all, not everyone has some deeply affecting story, so it stands to reason that not every POI will be someone with a great deal of depth of character and feeling. Besides, taken in context the episode fulfills its mission exceptionally well--it will keep us glued to our seats (or make extra-sure that nothing is interfering with it on the DVR) every Thursday night through May 17.