Let's have a quick rundown on what the dlc included. A few maps, two game modes, and two weapons. Considering you can't play the game modes Or maps, I sure as hell hope that the two weapons are effective. The claw isn't even good anymore. So if someone pays $15 for one gun, who am I to stop them?
I have the dlc, I use the rhino, and its OP. But I would much rather have a refund. No gun is worth $15, but a refund isn't going to happen. So I might as well use what I paid for right?