I think you kind of hit on it, but the Ravens looked really, really bad against winning teams prior to Detroit. They looked totally unconvincing on offense and more often than not put the defense in really difficult positions by turning it over more often than they needed to.
Detroit totally caught me off guard when the Ravens jumped out to a 20 point lead at halftime. Like, shit, when have we seen that? This win gave me a little hope because Detroit is a good team with an elite quarterback and the Ravens made him useless until Jimmy went out and when Jimmy did go out, the offense yet again stepped up to help secure a faltering defense.
I think you're right- if the Ravens play KC or Tenn, I think the Ravens could win. Against a NE or Pitt? Depending on how they close out the season, I could be convinced.
it's nice that for the first time in a while we get to be a "form" team (if only for 3 games lol)