So we'd all been spoiled for this one right? That is, anyone who is more than a casual fan and not going out of their way to avoid spoilers. I'd been looking forward to this episode for over a a month, and am glad to say it exceeded all my expectations.
The setup is pretty simple and short. Charlie gets a new office, complete with a huge stack of boxes to... do math on! What else? So he does math all night until Nikki comes in an yells at him for not working on the case he's supposed to be helping with. So he does the math, the team goes to stop some armed robbers, and Don gets knifed. With a freaking huge knife, by the way.
So they spend the whole episode 1. angsting 2. Trying to solve the case 3. Waiting for Don to recover. We fans know, of course that he'll be fine in the end because, well, no show without Don, right? But it's still tense.
The plot of the episode sounded kind of fanfiction-ey to me when I first heard about it, the the actual episode didn't come across that way to me, which made me very happy.
So I suppose all I have left to say is yay for boss!David. Okay, I think I'll stop now.