Kill Cameras are random most of the time, but some particular conditions will enable them: Slow motion kill camera is an exciting feature at first but then the novelty wears off.
There are disadvantages, especially if the Dragonborn prefers sneaking and ranged attacks.
Characters are capable of performing cinematic kills on the Dragonborn or on other characters as well.
Kill Cameras can be done on almost every foe in the game.
Wielding a One-Handed weapon and a spell does not void one's ability to perform a Kill Camera.
Certain One-Handed Kill Cameras cannot be performed while dual-wielding.
Kill Cameras can be performed with almost all weapons and even bare fists.
In addition, Werewolf or Vampire Lord finishers can also be executed.