We went on the Friday, which I guess can be described as quiet. The big countries don't start playing till 6pm and when we got there around 3pm, the South Stand (Party Central) was still pretty empty. As I really wanted to see the matches (read: Sonny Bill Williams, nr. 12 in pix below), we found seats a bit closer to the action but with a good view of the South Stand.
And despite being a bit quieter (or more sober at least) than the weekend days, it was really, really good fun. Some good rugby, a great atmosphere in the stadium, and easy to get booze and food. The opening ceremony included a dragon dance with a dotting of the eye ceremony, and to my excitement Brian O'Driscoll was one of the 'dotters'! David Hasselhoff was the other, but hey....I saw BOD!