Hey guys! I've recently been making Halo: CE playthrough videos in order to prepare for Halo 4! I've never played Halo: CE before and in turn, I have no idea of how the Halo storyline goes! So that is why I am playing through this game; I need to get the story line of Halo down before Halo 4 comes out! Join me in my venture! Let's start with Combat Evolved! Be sure to check them out here! Halo CE Playthrough - YouTube
343 already stated that you didn't need to play through the other Halos to understand Halo 4's campaign.