The point wasn't about how Master Chief helped Halo1's sales, it was about MS showing how to make a shooter like Halo2 or Gears stand out from the crowd by heavily using its main character in the advertising; and how Sony has completely failed to follow such an obvious and successful example with KZ2 and how it could have added to its less then expected sales numbers.
Actually the original post that started this whole thing is about main characters selling games. KZ2's main character being held up as being bland and thus part of the reason KZ2 didn't sell well.
The problem here is that Doom Guy and Gordon are orders of magnitude more bland than KZ2's main character and yet those games still sold phenomenally well...including the first game.
Master Chief was equally as bland. But contrary to Doom Guy and Gordon was actually used as a focal point for advertising for a later game (Halo 3).
If anything, it shows that main characters for FPS shooters rarely sell games.
Deus Ex. Well I remember his name was Alex (I think) but other than that not memorable. One of my favorite games.
System Shock 2. Another bland un-memorable main character.
Medal of Honor. Call of Duty. Hexen. Quake. Unreal. Return to Castle Wolfenstein. Noone Lives Forever. The list goes on and on.
007: Goldeneye is about the only game I can think of (off the top of my head) that arguably could have had a large volume of titles sold due to the main character... I'm sure there are others, but it's a very small exception to the rule. I suppose you could put the Star Wars games in there, but that's more the franchise selling it than any character. Dark Forces for example who ever heard of the main character from that before the game was popular?
In fact, in almost all gaming genre's, it's the game that makes a main character memorable rather than the other way around.
If it's a character that sells a game rather than the franchise selling the game, you should be able to move a character to a different genre and have instant hits. And yet the only place that is seen really is Nintendo's trademark characters. Banjo Kazooie also has gotten to that point somewhat by also selling racing kart games.
In the end, I don't think we can attribute even a tiny bit of KZ2's current (lack?) of blockbuster success on the fact that the main character was more bland than other FPS games that have succeeded...
Regards,
SB