Aside from the "on any given day" (as in on any given day any team can beat any other team - so good teams do occasionally lose to bad ones), simple fact, last year Portland LOST to bad teams. They lost close games and OT games. The start of being a good team is beating bad ones; and not all the teams Portland beat have been bad teams.
Good teams beat bad teams (most days). Bad teams lose to bad teams. Difference between this year and last.