Anyone playing Crucible seriously has noticed that since the last two patches the time-to-kill has plummeted. Destiny has become, for all practical purposes, a game with an instant kill meta. As I see it the balance is weighted heavily towards Thorn, Last Word and Red Death, in that order. All of which can kill in two head shots, every time.
Some say the solution is to buff all other weapon classes, but that would just makes it worse. The only real fix for crucible as I see it is to make the time-to-kill longer on these three weapons. That's the only way you re-establish any form of strategy or play/counter play between guardians. As it is it's an insta-kill fest.