Questions
How long should matches last? Is there a minimum and maximum to what is tolerable?
How accessible should the game be, and to whom (e.g. any person, any gamer, any FPS fan, etc.)?
What skills should be emphasized (e.g. dexterity, teamwork, strategy)?
What playstyles should be represented (aggressive offense, turtling, stealth, control, etc.)
How much preference should the game give to offense versus defense?
In what ways should the two teams be similar and dissimilar?
How difficult should it be to recover from a setback (slippery slope)?
Do we want different game modes? if, how many? minimum and maximum?