Not sure if this will continue for tomorrow or not but it's certainly on sale right now. If you're been holding out for a sale...might as well grab it now! Probably the cheapest it's going to get since it's a Games on Demand title and Microsoft is too cheap to make good games any cheaper (bad games they don't mind dropping down to 4.99 however).
I've never thought of classic Resident Evil controls as "Tank Controls". No tank I've ever controlled moved as smoothly as they do.