Halo 3 was the game 360 owners waited for, i got my 360 when Bioshock came out which was 1 month before Halo 3. Of course i also got Halo 3 and many other games, it was pretty much the fall of 2007 which made me buy a 360.
Reach while good, it has a strong compeditor named COD which is a bigger franchise now than it was back then. Halo is big though and it will have legs, i still say that by the end of this generation Halo Reach will be the most sold game on the 360, even though it came it short of 1 million on COD MW2. The reason of course being that COD gets updated now, wheres Halo probably has at least 2 years before something new in the Halo franchise happens and its not even Bungie so we don't know how that will turn out.







