Rugby and soccer are different. Rugby is closer to American football, but without all the girly padding. There is more mud and glory in rugby. And the game doesn't get interrupted every three seconds by an over-zealous referee.
Plus, rugby players are cuter. Look!

Joe Rokocoko

Doug "get a haircut" Howlett


And my favourite, Tana Umaga. He's so cute that he gets two photos. But then he went and retired, so it's hardly worth watching the World Cup this year. (Except for Rokocoko(kokokokoko), the one at the top.
He's worth watching. Not just for cuteness, but because that man can
run. And smile. His smile is the best bit.)
The NZ team, the All Blacks, do a Maori war dance before each game, known as
the Haka. Other Polynesian cultures have similar traditions, which is why you get Tonga and NZ facing off in the video
below.
In my opinion, the haka is the main point of the game. After that and the national anthems, it's all downhill and you might as well give up and go to bed. Unless Rokokoko or Umaga are playing, of course. Which Umaga isn't, because he retired. Did I mention that? I don't think he realised how much his retirement would affect my ability to watch rugby games, otherwise he'd never have gone and done it.
The other thing worth knowing about the haka is that traditionally the All Blacks have always done the
Ka Mate (Death) haka. This is very popular, but has slightly cryptic words (
very hairy man doing something, up and down and up and down, and something something sun shiny shiny, whatever), unless you know the story behind it, and/or your Maori is better than mine. Two years ago the All Blacks commissioned a new haka,
Kapa o Pango (All Blacks), which is pretty cool, and with words that are more clearly relevant (not so much of the hairy), but it upset people because of a throat-cutting gesture at the end. Now they kind of alternate between the two.
The Ka Mate haka can be seen
here.
Here's a slightly less usual variant: the leader takes his clothes off :)
Here's a karaoke version (you know you want to).
Kapa o Pango
here.