Blacklight Retribution was pretty great. I played quite early in its lifespan, during an event which gave me a special nameplate - nothing more than a participation trophy, and at the time, loads of people used it.

Signed in a few years later to.play a few rounds, and some guy begged me to let them use my account because of that now-rare nameplate.

(I also had an extremely cool helmet and some seriously powerful guns I got for free in that game's equivalent of a lootbox)