Yes, Call of Duty 5 will have a ranking system. It is going to be based like the Call of Duty 4 ranking system. Check out the gametrailers.com multilayer interview. They talk some about the ranking and perk system. http://www.gametrailers.com/player/41046.html
A website ranking shows the relevance of a homepage. If there are good informations and many visitors the website has a better ranking. And actually a website with a high ranking is worth much more than others.
That depends on which country you are referring to. In Constantinople, the Emperor would chose high-ranking church officials, until the end of the Byzantine Empire. In England, the king or queen still officially appoints the high-ranking church officials in Britain.