First week in the NFL is always full of upsets.
Also, there will be surprise teams as the season goes along. No one really knows what's what for the first 4-6 weeks.
Pats looked pretty good in their win, but their main competition looks tough (Indy and Pittsburgh), and I think the rest of the NFL has narrowed the gap considerably. I don't think they'll repeat this year, but I'm going to assume that they will anyway, just to maintain the faith.