Okay, before I get ninja'd, Red Orchestra 2 did this.
EDIT: Now to elaborate. In Red Orchestra 2, you start the multiplayer portion of the game as a recruit. You have all your gear strapped to your back, you have your helmet securely fastened, and you have the basic rifle.
As you level up, your gear gradually strips away from your character. By the end, your character probably just has their gun, a helmet, and a shovel. Your guns may or may not be battle-scarred, but you definitely will have attachments for them and you will also have picked up some enemy weapons.
From the enemy team's perspective, there isn't much difference between enemies, but if you stop to look, or you're playing with both a high level and low level teammate, there is a difference between the skins each player has.
Also, once you "finish" leveling up, you receive a "hero" skin. You basically turn into the dirtiest, patchiest, most battle-scarred and lightly equipped officer on the battlefield.
EDIT: Now to elaborate. In Red Orchestra 2, you start the multiplayer portion of the game as a recruit. You have all your gear strapped to your back, you have your helmet securely fastened, and you have the basic rifle.
As you level up, your gear gradually strips away from your character. By the end, your character probably just has their gun, a helmet, and a shovel. Your guns may or may not be battle-scarred, but you definitely will have attachments for them and you will also have picked up some enemy weapons.
From the enemy team's perspective, there isn't much difference between enemies, but if you stop to look, or you're playing with both a high level and low level teammate, there is a difference between the skins each player has.
Also, once you "finish" leveling up, you receive a "hero" skin. You basically turn into the dirtiest, patchiest, most battle-scarred and lightly equipped officer on the battlefield.