I'm not saying they're not selling because people think they're old and tattered. I'm saying they're not selling because people don't play those games any more. It doesn't matter what shape they're in.
People have long since abandoned Blops2 online too - lots of complaints about lag compensation. Those who would play it bought it in November 2012, not May 2013 - it may be listed at $60 in the shops, but if they actually managed to sell any copies at that, it'd surprise me.
That's the nature of incessantly-sequelled, online heavy games. Ubisoft, Activision and EA, the Axis of Copypaste, just need to put in a couple of extra things to the old game and they can sell it as a new game the following year. The online portion of the old game dies as all the attention-starved NEW SHINY THING NOW gamewhores and kids go get the new one and everyone has to follow or their online experience dies.
Right now people are interested in AC4 (which I won't buy, because AC3 was bummed to death by DRM), BF4 (which I won't buy, because BFBC2 was appalling) and MW4/"Ghosts" (which I won't buy because I haven't bought a COD game since MW2 as they refuse to fix the hacked online for their existing game in favour of whoring the next one). ACB, BFBC2 and MW are relics.