Shall I just not rank the missions that weren't actually missions, such as Heretic, Armoury, and Arrival?
Though I guess you gain control of 'Chief during Armoury, and it could be seen as an exposition level. The only "level" not featuring any shoot-bang.
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You're welcome to leave them blank if you want to, blank entries are simply ignored in the results. Some choose to rate those "cutscene missions". I thoroughly enjoy them for example and did rate them.