It is an absolute must... intros, credits and other elements play key roles in video loading. By the way developing an in-game cut-scene is not an easy task... I'm perfectly fine with rendering out something in 3DSMAX or Blender as a video and having it load when needed rather than dealing with the scripting and bugs that would come of a in engine cut-scene.
For instance the Dead Island (1) and Far Cry 3 intros were pre-rendered.
x9 (FPS Classic) had the ability to load videos. I don't want anything less than what x9 had. I want the same or more. This is why I am often frustrated with Reloaded at times/or inpatient.
Also in x9 we had several camera scripting commands you could use. We need these back in Reloaded as well. Small cinematic scenes this would be particularly key for with simply having actors move about to certain locations as the player is assessing the new scenes. For instance Metal Gear (1) after climbing out of the water in the first stage.
i7 -2600 CPU @ 3.40GHz - Windows 7 - 8GB RAM - Nivida GeForce 420 GT