From the highlights, the Bills look like the real deal, but the Chiefs were as bad as I've seen them for a long time.
As for the Browns, what can you say? We should have won at KC and we should have won last night, but busted coverages have cost us some massive touchdowns. In Chubb and Hunt we have the best run game around and the O line is providing them lots of opportunities for big yardage. As I said last week, if we can get a fit Landry back then we'll have even more options and we might just be able to score enough to cope with the odd deep TD against us.
Might not be this year, but I feel the Browns will be contesting a Super Bowl soon enough if they keep improving as they have done.