Halo only has a decent multiplayer
main game sucks
Metroid Prime = Halo in general
the only reason why Halo sold more that Metroid is because there were more Xboxs sold than gamecubes, haha Prime 3 may not be as good as Halo 3 as of the lack of Multiplayer but Metroid is gonna thrash Halo in terms of sales, and sorry to say it but i see it outselling Killzone however with that said Killzones a great game as i liked its main game and multiplayers good too, but the SONY part kills it for me as i aint getting a PS3