Some entirely random thoughts:
JULIET
Seriously, Juliet was, without a doubt, my favourite Lost character and it sucks that she's now finally dead. Damn you writers for making me think that she could be alive (let's set aside the whole nuking thing for now).
John Locke as the show's new uber-villain? Fucking brilliant. I can't wait to see Terry O'Quinn heeling it up. And that his interaction with Ben is continuing. Every time those two are on the screen, it's just electric.
Jack continues to give me zero reason to care about him. It's a shame he's suffering from the syndrome of the side/supporting characters eclipsing him. I really hope that the series ends with Jack dying. He's already gotten off the island once.
Sayid's death and resurrection... well, at this point nothing's shocking me. And to be honest, if Sayid had died as well as Juliet, I would be beyond pissed.
Hurley continues to rule.
Every time Lost throws more curveballs in, it just keeps me gripped. I'm really not going in to this series expecting to get many of the answers I'm looking for, really. For my money, that's just the nature of the show I signed up for. If they wrap everything up at the end then, frankly, it'll just kill the mystique which, for me, has been built on the fact that we don't know everything (or, indeed, anything, in the grand scheme of things). I love the direction this season opener took. It began to draw the threads back together again, but ultimately, reminded me that the answers are not going to cohere to any idealised roadmap.
In short, I quite liked it.
RIP Juliet.