For me, the thing that makes Halo what it is is the storyline that follows Master Chief and Cortana. While Halo Reach and Halo 3 ODST were enjoyable, they don't have the same value as Halo 1-4. Firthermore, in Halo 3 when Master Chief and cortana are seperated it just felt empty. With that in mind, I am anxious for Halo 5 to see if Cortana is brought back because without her Master Chief is just like any other Spartan except for being more skilled and lucky.