The return of Lost is something to be celebrated and embraced, like the return of Spring or the start of a new football season. It's just good. Don't judge. Don't argue. Just enjoy.
At this point the plot is so byzantine, complicated, and now self-referential that there's really no point analyzing all the cool ways last night's double episode stretched and folded on itself (I'll leave that to others). I will say that the story was surprisingly coherent, and they went out of their way to summarize and explain everything so that you could still keep up even if you weren't paying attention. Heck, Hurley summarized the entire plot up till now in just a few sentences which left me thinking that there haven't really been that many big events -- it just feels like there have been. Anyway, I also appreciated the fact that even though we're now lost in all four dimensions (and not just three), the jumps were easy to follow and the clues allowed us to understand when we were at all times.
Overall, the new episodes kicked things off with a bang, and I'm looking forward to where we go from here.