Time for a vocab lesson.
"" - the empty quote here refers to the game he was talking about, Modern Warfare 2.
"One Man Army" - a perk in multiplayer that lets you switch your class mid-life. It has the bonus of refilling your ammo.
"then" - He means "than". I don't even want to ask.
"Noobtube" - a false name for a more and more popular under-barrel attachment on most assault rifles that fires a rifle grenade, usually an instant kill.
Me? In COD4, I had a class that held two assault rifles each fully stocked with rifle grenades. And I'm proud of it. It's especially nice now that there are no dedicated servers where professional game designers (sorry, meant to say admins) dictate what weapons we can use.