My problem with this season so far has been twofold:
1) The writers made the same mistake they made at the beginning of Season Three; they made the (at least on-island versions) characters sit around passively while the Others say tantalizing things and never answer a damn thing. For at least five episodes, our heroes have just been chilling out. That's not great TV.
2) The season is shaping up to be more about this epic battle between Jacob and Smokey and ultimately our heroes seem to be passing by the wayside. These are characters we knew existed only a season ago (caveat: yes, I know Smokey has been on the show since the beginning but as a character he's new). Instead of having the denouement of the show come from the characters, we're getting the story of something completely external that makes our characters merely pawns.
Last week's episode was a step up and since they've left the Temple I hope things pick up more significantly.