Has it though? Considering black ops is a constant series by treyarch and uses the same engine it has since black ops 1, 3 has actually been in development for a long ass time, I'd bet they had 3 in development at least 3-10 years ago and since bungie signed their activision contract in 2012, it was only in true development (as in actually going to happen) for 2 years, you don't know that they didn't borrow ideas from call of duty (which they have, every fps has) and as I said every game has similarities to pretty much every game, it's not ripping off at all.