One of my favorite moments in the previous episodes is when they presented Jim Corrigan without making too much fuss over it. It reminded me that Constantine is part of a much larger stage and he is just one of the players (not even among the big ones)...
The introduction of Faust had the same effect. I am mostly unfamiliar with the way it is played as a dumb character (he fought the entire JLA at some point). For me, he was a part of the bigger picture, and he being here was another example of John dipping his toes into bigger waters.