There are no perfect teams in this NFL season. The Ravens have looked pretty close for the past two months, and the Patriots got off to one of the hottest starts in league history, but there's no team that would be a mismatch for everybody or a favorite to win on every other team's home turf. Each of the league's playoff contenders has weaknesses.
Of course, if they run into a team that can exploit those weaknesses, the results can be fatal. Think about the 2017 season, when the Jaguars manhandled the Steelers in the regular season and then beat them again in the playoffs.