If you give Flacco Derek Carr's OL, Ravens would probably be a very solid 5-0. If the Ravens committed more to the run, if for no other reason than to open up the play action, Ravens would probably be a very solid 5-0. If Flacco's receivers beyond just SSS and Wallace made plays for him (a luxury literally every other QB we've faced this year has had), Ravens would probably be 5-0.
I've seen games where Rodgers struggled a lot because of poor pass protection. Same with Brady. Flacco is far from perfect, but you can't put it all on the QB when your OL is in shambles week after week.