So I know must folks rightfully stopped watching or didn't watch in the first place. But in the finale Cortana takes over MC's body and saves the day. MC wasn't good enough so they killed him off, essentially, so Cortana could save the day.

Edit: I should add the Covenant human chick was killed by a Spartan chick but the Covenant was planning on killing her anyways.

So I know must folks rightfully stopped watching or didn't watch in the first place. But in the finale Cortana takes over MC's body and saves the day. MC wasn't good enough so they killed him off, essentially, so Cortana could save the day.