How to become a rugby fan?

The Super Rugby competition (Colloquially known as 'Super 15') is possibly the stand-out competition for club rugby. Given that it's contested by 5 teams each from the 3 highest ranked nations I would assume the standard of competition would be higher. The Tri-Nations, possibly Four Nations in 2012, is contested by the top 3 countries New Zealand, Australia and South Africa so once again based on rankings I would assume that's the premier International competition besides the World Cup this year.