I noticed it last season too but the thing is we won this game so I don't even remember it as much in the long run. I can live with the near heart attacks as long as they win and make me happy to be alive to see it!
I think, LTF has a good point. They may not be up to 100% shape yet and after playing lights out in the first, may of just lost some steam by the second. But still, I want to emphasize, the second half in and of itself was awesome, just a shade less than the first as many may of been running out of steam.