Thunderlord. First week the game was out if I recall. I did an all nighter to hit 20 so I could use it and then kept playing with it. In a world where very few people were any good at the game and even fewer had exotics you could shred in the crucible. There was a control map that's no longer in rotation, I believe it was on Mars that I loved. Camp the heavy ammo spot, kill everyone that comes to it. If you were careful you could keep heavy ammo the entire game.