I think the premise is great and the combat system is solid, but putting it up against Blops2 (PS3), Halo 4 (consoles) and P4G (Vita) was a stupid idea. I've seen plenty of web banner ads but nothing outside of that. Sony never markets well, and that goes double against games that were marketed very well at the same time.
This would've fared much better in September imo.
PSN/GT/Steam: Ravendust Reviews are a metric of quality. Sales are a metric of popularity.