To be honest, the games have needed them to create any type of atmosphere.
Have only been able to watch England on TV and at times it's ridiculous how little noise 25,000 people manage to make at points in the game, the atmosphere reminded me alot of a women's football match. At least when the Mexican wave is going on it sounds good on TV becasue there's loads of noise but you normally can't actually see what's going on in the crowd.
Not sure why UK RL fans haven't worked out how to create an atmosphere at England matches yet. Looking forward to going to Wembley on Sat, just hope we can get a few songs going...