One of the things that interests me about the Quesada-era Marvel is the unspoken, quiet relaxation of the "no killing ever" rule. It was a major fixture of the Shooter years, DeFalco perpetuated it, and Harras seemed to as well.
In Quesada's Marvel, though, killing seems to be viewed quite differently. Luke was breaking HYDRA agents' necks in Iron Fist, Clint blows away Skrulls without really thinking about it or facing censure, Cyclops mercy-killed that one dude in Morrison's run, Nick Fury is shooting a lot of former SHIELD agents...