Setting and action is Halo, which is amazing. But some characters and events in the story is off and not so canon to the original games unfortunately.. I hope to see Master Chief keep his helmet on.. but I guess before the fall of reach Master Chief must of been more.. "human" I guess, especially though the events of reach. It will make sense if he kept his helmet on after reach like in the games due to trauma and always ready to fight etc. if we get more seasons.
Update: Thank God it was cancelled. Next time if your going to make a live adaptation of Halo please keep the helmet on and stay close with the lore material. Appreciate the opportunity for Halo to get a series but let's get trilogy movies and have actual fans of Halo showrunning and directing.. please.