User blog comment:KATANAGOD/Black Ops II's open gameplay explained/@comment-72.203.153.131-20120521011554/@comment-3140952-20120522110436

Honestly, a good SP is much harder to do. You need to build strategic levels, you need to work out the pacing, you need to work out the challenges, you need to have good A.I. (optional in the case of CoD), while in MP you only need to put at least two armed players in a map and they'll have fun. It's good that they finally focus on the SP, because if they pull it off, the game could have much more replayability and much more variety (it won't be a MP only game anymore).