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Bioshock and Metroid, are going to be quality wise probably in the same level. maybe with a little advantage to MP3 for controls.
Sales-wise, Metroid should easily beat it, just because it is Wii`s top shooter, thing that Bioshock isn`t. Online is really important for 360 titles in order to sell great. The only exception is Oblivion, but that game is from a genre which has very few alternatives in 360.

So:

1st week - 250k
1st month - 550k
End of year - 1.1m