The PS4 version of COD Ghosts actually outsold Assassins Creed 4 and Battlefield 4 on PS3 too. On Wii U its just another multiplat game, on PS4 its literally one of the only titles worth having... it's probably the top pre-ordered title for it.
GAME in the UK are using COD as a promo tool for PS4 and Xbox One, they have a lot of floorspace dedicated to those versions of the game. Contrastingly, when I picked up COD Ghosts for Wii U last Tuesday -- it didn't have any shop floor shelf space at all. I had to ask for it because it was kept behind the counter (on view, but behind the counter). I doubt Activision will be too surprised by the discrepancy, but PC and Wii U have accounted for <1% of COD Ghosts sales, which according to the MCV thread are already (all platforms totalled) way down on Black Ops II... so I'd guess they won't exactly be thrilled.
Ghosts' game population is looking better than BO2 after only a few days though, it seemed to take BO2 to take months to achieve a couple of thousands and people only seemed to play TDM... people are actually playing the other modes now. If it can keep adding some more people over christmas, it should be a healthier multiplayer than BO2 Wii U was. I seem to have ten people on my friends list (gaffers mostly) who are playing it at any one time too, which is nice.
