Once Upon a Time is a good show for a lot of reasons (strong female leads, good acting, an ambitious premise, great writing) but it would be easy for the show to lose sight of the forest for the trees.
The Lost finale was a tragedy, a genuinely uninvolving and downright dull botch that not only fails as a stand-alone episode and fails as a finale, but lessens the dramatic impact of the last six years.
It's gonna be so awesome. All my questions will be answered. Why are they there? Is it purgatory? How come the fat guy hasn't gotten skinnier despite being on a deserted island??!?!? Oh wait. Strike that. I've never seen an episode.