I buy that there would be lots of disagreements and stuff, but a lot of times people seemed to be hiding important information from other people just for the hell of it.

For some characters it makes sense that they would hold things back (Hurley doesn't tell people what's going on because he doesn't want people to think he's nuts and generally doesn't like to rock the boat), but why wouldn't Kate tell Jack about the ... well, not to be too spoilery ... the question mark?

Anyway, I'm still planning to watch season three (for a while at least).