Speaking as somone who admires most sports, I think both League and Union have atmosphere at tests on ocassions. However, the Union guys will admit that test against Ireland, France, Scotland etc are generally not as intense and therefore the crowds are not as intense. Bledisloe's and the tri nations series are generally well supported and have atmosphere. Rugby League tests seem to have atmosphere only if they are NOT played in Sydney. I am not sure what is says about us as Sydneysiders but we just seem to be lacking in this department. (By the way, you want atmosphere, go to a Sydney FC game and join in with the cove. Awesome experience).
As for World Cups, Football can really only lay claim to the only truly World Cup since nearly every country in the world plays football and the top 60 or so are competitive (Australia was lowly ranked and beat Argentina 4-1 when they were the WC Holders). Yes only 7 countries have one but to win a tournament requires many wins which is usually too much to ask the lesser rated teams. However, they can jag a win here and there. I am pretty sure that in Union, there re only 8 or so teams that can win any game and in League only 3.
Surely even you Calixte will agree to this or will you?