A lot of people who don't know what Metroid is are going to buy it because it's an FPS, and has a lot of hype built up around it. So it should sell better than Prime or Echoes.
Remember, the Wii has a lot of new customers who didn't own a Gamecube. Red Steel sold well even though it was rather poor as a game. Metroid is going to be awesome, and sell to a larger userbase than Red Steel. It should do very well.







