Both Dallas and GB looked good, but it's worth noting in both instances that their opponents failed to generate any meaningful offense.
I think New England will struggle this year without viable receivers. They need to make some moves to get someone in there that can create some means of separation and be an option for Brady. I suspect that this is management's most pressing issue at the moment. A huge part of their defense is fueled by offense, much more so than any other team in the league imo.
KC looked good, or better yet - Alex Smith looked great. I don't know where they will stand come December, but they kicked off their season on a great note, beating up on New England the way they did. But (imo) they're not as good as NE made them out to be. New England couldn't have played worse.
There's talk that Andrew Luck might be out of Indianapolis very soon, and if so - I find that bad for the organization. The Colts have morphed into a 4-12 team under Pagano's leadership, so maybe they should keep Luck and get rid of Pagano. GM Chris Ballard just walked into the job back in January, so it's too early to tell if he knows what he's doing. Judging by the personnel moves made in the off season however, there's not much to be excited about there. Then again, Irsay is as much a problem as anyone else. There not gonna fix that, not as long as he's writing the checks.
Officiating has already been absolutely dreadful in just the first week this season. Not a Seahawks fan by any means, but there were at least 4 mind-boggling bad calls in that game alone. Might be time for the league to develop full-time officials, me thinks. Some of these refs are just clueless.