EA didn't invest on ads and apart from that.....they transform a PS3/X360 shooter into a on-rails game, it is more like to say that they downgraded the game beacause it was for the Wii.
And one last thing, Dead Space didn't sell like hotcakes on PS3/X360 either.

I wonder how sales for Dragon Quest X and Monster Hunter Tri will be worldwide, maybe then we can talk about mature/high budget/high quality 3rd party games sell on the Wii.