Good thing too OMP is really a waste if you can't give it all it needs to be great. Most games now an added horrible OMP just so they can say they have it. If you can make a good OMP that doesn't take away from the single player game, can stand on it's own and support it with content(and fixes if it needs it) I'm all for it. If not then don't bother trying to force one into your game, even more so when they are a meant to be single player games like this one.
--- PSN Drmoogle. RPG fans check out Ni no Kuni: Wrath of the White Witch out Q4 2012