One thing I don't think has been commented on except in passing is what was going on with Jack and Kate before Sawyer came back. The crosscutting between the idyllic golfing scene and Eko carrying the wounded Sawyer and all the drama in the woods was great TV, but it kind of drowned out our noticing that Kate and Jack seemed to be getting on really well, joking around, etc. (I loved the line where Kate asked if he played golf, and he said, Kate! I'm a DOCTOR!). Kate seemed to be moving on, and Jack seemed to be trusting her again. And then when Sawyer returns wounded and Kate is doing her whisper in the ear thing, Jack looked really hurt.
I know, not the great philosophical good and evil debate, but the romances help keep the show alive, too!