I think this was a good way to end the Pusher storyline. It was emotional and full of drama in the end scene.
As usual, Mulder becomes very passionate about this case and Modell knows and uses it against him. As much as I enjoy the Mulder/Scully dynamic, I also like to see the way both argue trying to proove each other's theory to a point that they get angry at each other.
I always enjoy how Scully becomes so protective of Mulder knowing how vulnerable he can be and how much damage Modelll did to them in the past. And I loved how in the end Mulder recognizes who the real Scully... just because they know each other so well.
Good episode overall.