I have compliled a list of things I think the commentary must have
* Detailed and realistic introductions
* First names and last names of players
* Fluent commentary, not "Oh, pause, ThauThau, pause , and what a try..."
* Say what happens immediately
* Natural (real) sounding commentary. Like FIFA11 (Rugby 05,06,08 sounded like lame acting)
* History, background info, statistical, and overall commentary on game in conversation format between commentator and colour commentator. eg Discuss weather, pitch, game strategy, history of stadium, current rugby issues)
* Sideline reports
* Focus on what is happening and what could happen, maybe throw in a few predictions eg: "He has a man on the outside, Will he use him?" "There is no one back deep for NZ, will they kick". A commentator can direct possibilities to the audience as well as report what is happening now"
* Get EXCITED, this usually contributes to the playing experience eg (Skysports Australia)
* Make sure that what is said is clear, in Rugby 05,06,08 it sounds as if Ian Robertson's voice dissappears in the noise of the crowd and it distorts
* Involve the colour-commentator by referring to him more and asking his opinion, this minimizes repetetiveness.
* Throw in some comparisons, metaphors and puns
* Remain objective