(I don't post for ages, and then when I try LJ's down. Enough to make a girl paranoid.)
Let's just put this out there first of all, since there's been a lot of bitching and moaning over the general direction this season. I don't actually care if it becomes the "Harvelle's Roadhouse" show with special guest appearances by Dean and Sam. It never will, despite the panic, but even if it did I would be fine with that. For as much as I love the boys, Ellen is just that awesome.
As for the show itself,
I liked it a lot. First time SPN has actually freaked me out while watching it (girl trapped in confined space, never fails). Ever since I saw the previews I hoped that this may be the episode where I fell in love with Jo, and oh boy I did. However, I could just tell how fandom was going to hate her every step of the way. She just clicked for me, all desperate and adventure-romantic and naive. (Some of the buttons as Steph, come to think of it.)
I'm usually a huge Sam-girl but I didn't really miss JP this episode. Partly because the nature of the series means that not focusing on Sam or Dean makes a nice occasional break, but also because Jo was pretty clearly set up as alt-Sam - college-going, researchy, in love with taunting Dean. Yet she'd actually been sheltered far more than Sam ever was, contrary to some of the fanon out there. Dean's protectiveness of her makes perfect, if vaguely surprising, sense. Jo's what Sam wanted to be, and all she wants is to be Sam.
As for the final revelation, well I've never been Jossed and Kripked in the same speech before. Yes, John was there when Ellen's husband died and she blamed him. But he never showed up again, thereby putting the kibosh on my epic John-Ellen fic (strictly platonic though guys. For some reason I am virulently opposed to John/Ellen, possibly related to my unjustifiable yet obsessive Ellen/William OTP.) Pity, since I was madly in love (or at least was actually considering writing for once) with it, especially with the idea of John pitching up at the Roadhouse after many years immediately post-Stanford fight.
Ah well, 'tis the nature of new canon to inspire new fic ideas while destroying the old.