I'm down about the result, but not overly worried. The good things are that there have been no REALLY bad performances (think Miami last year) or games where I thought we were completely out of it.
The things that will need to improve are the pass rush in situations where the other team isn't chasing the game (and therefore the D knows they have to pass) and the co-ordination between Brady and his receivers. They know it and it is obviously something they will continue to work on.
I am a lot less worried about the O line than I was this time last year. In particular, Koppen seems to be spending less time going backwards.
I think we will make the playoffs and be in the mix with everyone else. At this point, the teams to beat seem to be Denver, the Giants and Vikings. All look really good and I would worry about playing any of them.
2007 was a once-in-a-lifetime thing, something that defensive co-ordinators have now had two years to learn to defend against. It is unrealistic to expect a repeat of that.