Right, as usual, I won't be spoiler marking these. If you're reading a Lost thread, you really should be expecting spoilers.
I hope Lupido isn't dead. He's one of my fave minor characters. We saw him get knocked for a loop, but it's not impossible for him to live.
Still, three main characters are dead. Well, two for sure. As for the third, we saw the explosion, but surely they'd give Sayid a better send off than that. I honestly hated how drawn out the Kwons were. It was pretty damned obvious, right down to Jin's line about never leaving her.
A thought occured to me that hasn't been addressed, yet: How does a Candidate get crossed off? It's not through just death, since Kate and Claire are still alive. In fact, what about Kate got her crossed off? Sawyer's done just as many awful things, if not more, and he's still a Candidate. I have a feeling we'll get a lot of explanations in...well, that episode I'd mentioned a few weeks back that's apparently planned.
Overall, yeah, not one of the better episodes of the season, to be honest. As soon as I saw "Locke" hand Jack the backpack, I knew what was going to happen. No idea why Jack wouldn't think of that, either.
It's...kind of surreal, though. We've got four more episodes left, now.