I don't really blame Ubisoft for being reserved on marketing, end of the day they're not going to see much of the cut once Grasshopper have had their share. Marketing costs money and to get the title 'out there' like most people on here want just isn't financially viable for what is a nishe game with limited appeal.
It's doing good, like for what it is you can't expect incredible numbers. It's not going to inspire any third parties or break any records, this sort of game couldn't exsist in normal circumstances and it's incredible that it got a sequel.