This isn't a "flop per se". Look at the other "1st week" sales on the chart. There are several on there and they are lower than Heavenly Sword. From a pure numbers standpoint, relatively speaking, that is a good start for the game. Obviously it is going to have to have longer legs than normal to make money for the developer, though, as I suspect this game is a "next-gen budget" game and will need to sell 400K+ to get close to break even.