As a PC player, I only ever played Halo CE, Halo 2, and Halo: Reach. I have to say Halo CE is my favorite, I passed it countless times. In Halo 2 weapons and sound effects somehow felt weak, even though the game featured ragdoll physics and was much more cinematic. Halo CE on the other hand had that unique sense of mystery that no other Halo game had. You don't know the origin and purpose of this Halo ring at the beginning of the game and the revelations are so cool.