Here are my thoughts/questions on the premiere.

http://doubleofive.wordpress.com/2010/02/03/lost-thoughts-lax/

Its alright now, but its not the same magic that season 1 had, when EVERYTHING was a mystery. My friends and I have examined everything so closely that except for the flashes, nothing really came as a surprise.

I'm still going to finish it out, just to see what happens. Unlike Heroes, which rebooted every season so that there was no overarcing plot anymore, and multiple contradictory answers to the most basic questions (they got their powers during the eclipse, no the eclipse takes away their powers, no there have been mutants for GENERATIONS). Lost still has some basic mysteries left over from the Pilot. I'm sure the writer's explanations have changed, but giving it an end date was the best thing the show could have done.