If it is a mmofps, please do not make it have custom loadouts where you have to progress in rank to get a different or better gun, perk, etc.
This stuff is literally killing FPS gaming for me and I really am having a hard time finding a new FPS game that doesn't have these things in their multiplayer. I am having a hard time finding a FPS game that really stands out anymore.
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Why not make it like a Fallout system? Better guns are in more challenging areas? Ammo and stuff is littered throughout the world. You can have RPG elements, but with health and abilities, not in your arsenal.