Years ago I started watching international cycling races -TDF, Giro etc, without any knowledge at all of the tactics, individual or team, nor of the different types of racing involved in the different form of the sport. I am much indebted to the likes of Phil Liggett and Paul Sherwin for enlightening me along the way, and now we also have Matthew Keenan calling the races, an Aussie who is one of the best, and Mike Tomilaris of SBS whose commentary on the sport is top class. The importance of good commentary cannot be overstated.
One other thing - commentary should be even handed and without bias. Greg Clarke, Phil Kearns et al are very one eyed when it comes to their favourite team, especially it seems if it happens to be the Tahs. This is a lesson that the caller on bar tv needs to learn as well. He gets particularly shrill whenever his side does something. It is enough to make a sane person want to turn the coverage off.