User blog comment:JoshCF1/The State of the Call of Duty series./@comment-1916935-20110206000652

I think it is starting to go downhill, but that's just because of its popularity. People are hacking and doing anything they can to find OP weapons to impress people. BO brought in a slight change of gameplay (IMO), but that's not good enough. In 2-3 years I bet you'll see sales decline.