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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The experience earned by playing the game is ultimately the reward high-ranking players receive, so giving everyone equal firepower works in that sense as the longer you play the more you learn to improve.