I never understood the point of duel weilding. I perfer having a grenade ready to throw rather than having a spare bullet hose.

It's not a bad option, but I never used it, and I rarely ran into other players using it. It's neat, but fairly useless.

the reason you cant duel wield is cause they wanted the game to play a little similar to halo one and bring back some memories of the original glory days of holding one weapon.

I agree halo 3 was a letdown :p. As for dualwielding... carnage was nonexistent. All dual wielding guns still took seconds when aimed right at an enemy to kill them. And dual wielding shotguns should absolutely not be included. Seriously... even though Modern warfare 2 is trying to be realistic... have you ever tried running backwards while shooting double shotguns? i don't care how big you are. Film it for me. As for the HUD thing, i believe you really are thinking way in depth. I read a few of the books, and played the previous games, and I see where you are coming from, but I do not believe that is the makers' reason.