The difference between the original Halo and Halo 4 is extreme. Old school versus modern game design. Gameplay driven versus cinematic.
Halo 1. An old school game. Almost feels like an open world game compared to modern Halo:
Halo 4. Inspired by Call of Duty. A heavily scripted and very directed experience (through Cortana's voice, by use of dramatic sounds and effects to draw your attention and tight design of the level):







