There is not enough button-pushing this season...
I think a lot of it is due to the lack of mystery - We know what happens if the button doesn't get pushed, we've seen who the others are and where they live, we got a good look at the monster, we know a lot more about each character, what's in the hatch, etc.
I think they are trying to manufacture a lot of new little mysteries, but they are not as gripping as the originals that sucked you into the show in the first place...
Most of the questions I still have about the show are all things that are left from the first season, things like:
- what the hell was with Walt's powers?
- what was up with the freaky numbers being everywhere?
Unfortunately, I don't think the Walt thing will ever get explained as they just wrote him and the dad (Michael) out of the show and we're left thinking there was nothing more to Walt than a cheap plot device...