Beyond that, I think it's worth examining the motives of the player. Why do players want to cheese arenas in the first place, when more aggressive play-styles are more fun? Why are players drawn to conservative styles of gameplay, and what can be done to change that? I think if a shooter game is well designed, the player will be eager to jump into the fray as soon as they can, and the game will reward them for that sort of aggression. Doom 2016 does a great job of this; aggressive gameplay is rewarded with more abundant health and ammo drops. Conservative gameplay isn't rewarded; moving slow gets you killed, and staying far away from the enemies gets you killed.