Just like Kill Zone 2 is the most over rated PS3 game in history.
According to VG Charts Killzone only sold 1.98Mil copies world wide...
http://www.vgchartz.com/games/game.php?id=12253
Halo 3 however sold 10.26mil world wide & since its Release ODST, which has only been out a month or so has sold 2.82mil. Out selling the Mighty PS3 game.
http://www.vgchartz.com/games/game.php?id=12253
So yes Halo might be overrated but sales figures speak for them selfs. 10mil people wouldn't buy the game if it sucked now would they.
And yes I am a Halo fanboi, not denying it.