It sold 70-75% of its shipment (excluding digital sales), lots of 3DS games are still between 20 and 40%.
EDIT : beaten
Sorry but that is no excuse, that just means that it had low expectations. Add: Given I don't much about the title, or who made it, haven't been following titles that I don't know if it will make it here or not..
I just find it amusing you are quick to defend any title on the vita but are super critical on 3DS titles, but hey Vita does deserves more than this.