I dont think Appolonia was "all that" in the film but I would have liked to have gotten to know her character a little better....maybe then I would have felt at least a little bad when she got blown to bits.
In the novel....does Michael tell Kay about his Marriage to Appolonia when he gets back from Sicily?

"Leave the gun. Take the cannolis.

"We're all gonna be three little Fonzies - and what was Fonzie?!", "Cool?", "Correct-a-mundo!"

- Jules and Yolanda, Pulp Fiction