Seriously, I think that the first 55 minutes of this episode were some of the worst episode the has done since the not-yet-addictive early days (IMHO, everything pre-"Hi, Society"). The characters are doing things that make no sense, even in heightened, campy, teen soap world.
And the Chuck story? WTF? I guess it's setting up a new long-arc storyline/mystery about Bart, but boy was that clumsy.
Meanwhile... finally, Dan and Serena are DUNZO. God, I hate Lonely Boy. He's such a dick. But I'm suddenly giving a crap about Rachel Carr...
But, seriously, after all her dealings with the Chuck Basses of the world, Blair let herself get (almost) taken down by this young, wide-eyed ingenue teacher? Really? REALLY?