This episode successfully dwells on the two central student characters, Rachel and Finn. Both show a morality and conviction that make them good leaders. They make mistakes, but they feel guilt, and take responsibility. Michele and Monteith are definitely sure in their footing as the duo, drawn together, but avoiding committing to it, for a variety of reasons. Rachel even tries to befriend Finn's pregnant girlfriend, Quinn (Dianna Agron), cementing Rachel as likeable, despite her flaws. She also makes an effort to be a team player, something important in her growth. And wrong or not, Monteith is hilarious in "Vitamin D" when Finn takes the drugs.
It is a little frustrating that Glee continues to dump on the public school system. While Terri is the one who actually insults the establishment, saying she needs no training to be school nurse because of their low standards, the fact that McKinley High goes along with that backs up the negative, and largely inaccurate, stereotype. Certainly some public institutions have their flaws, and no system is perfect. But many public schools in this country, and in Ohio, are very good, and few would hire someone unqualified to be there. In most places, that would be illegal.
Which makes it a stretch that the only punishment shown to anyone involved at the school is that Sue will now be the co-director of the New Directions, to Will's frustration. That's an interesting plot, and one that will be explored further, but there are ways it could have been gotten to without going totally off into left field. Poor Howard Bamboo (Kent Avenido) is arrested, but assumedly he is let go once it is revealed he isn't directly doing anything illegal, since he later appears in the show, seemingly unaffected by the experience. Though he is an accomplice to illicit activity. No idea why the police investigation doesn't lead them to Terri, who does deserve jail time.
Also slightly offensive and unrealistic is that Sue would put a nurse in a coma as part of her plan. Sue is ruthless in many ways, but to show her causing severe physical harm is not funny, nor should it be acceptable on Glee. The fact that she completely gets away with it is even worse. Doesn't this school have cameras in the hallways, as most do nowadays?