Ever since things starting heating up on Nikita, the show has been caught in a predicament. It wants keep the tension going, maintaining a credible threat so we think something bad might happen to Alex, but the drawback has been the elimination of other characters. She's almost caught nearly every episode and in some of those episodes, I'm sure plenty of people thought she'd actually be caught. In the end, though, Alex's biggest problems were solved by characters deaths (Thom, Jaden). After a while, you see how this can't work in the long-run, because we'll catch on that the characters outside of the main ones (Nikita, Michael, Alex, Birkhoff, and Percy) and easily expendable and that they should be taken lightly.
At the same time, as options become limited, the initial concept of the show--Nikita on the outside with her mole on the inside--has a very definite lifespan, and Alex is increasingly closer to getting out. The ending of "Glass Houses," with Amanda showing her cards, should be enough to push her over the edge--unless Amanda is killed and all is fine again.
The main plot was fine, but the more I think about this black box system, the more absurd it sounds. Percy doesn't keep tabs on the guardians besides tracking devices and doesn't make sure every guardian is fully aware of and prepared for the Nikita threat (and by that I mean personally making sure they have guns up the wazoo). Also absurd is that Michael and Nikita can be seen publicly when Division supposedly has access to cameras everywhere.
Score: 8.2/10