I agree that the ending was anticlimactic, and they didn't give enough information to know if I should care or not: if the bomb went off and the plan was truly successful, then the plane never crashed and everything resets, so Juliet isn't actually dead and no one knows each other. Seems unlikely that it's that simple, though.

What excited me about the finale was Jacob, and the statue, and the "Nemesis", and Richard, etc. I think that is the hook for what the final season will be about, the centuries-long war between Jacob and whatever, perhaps intertwined with the war between Charles and Ben. The whole bomb thing seems like kind of a sideshow to that, and mainly a way to somehow wrap up the whole time-travel thing, which I was mostly kind of annoyed with. (I think I agree with jwz: stories that feature time travel but are not about time travel never get it right.) My guess is that Miles was right, and the bomb actually created the anomaly rather than destroying it, and that somehow the characters will all pop out into the present day (except Juliet and maybe Sayid) with the timeline being intact. But I have faith that they'll fill in the blanks better than that. Crossing my fingers, at least...