The tradition says that the hosting country needs to present their history and culture, well unlike other countries, China has a long long history illustrate.
It was a spectacular ceremony, many of the tricks were used again and again in previous ceremonies, but the Chinese made a step further, imagine being there and living these moments, imagine being an athlete and savor these moments/memories for the rest of your life...
Out of respect to them the Chinese expanded their ceremony a bit more than the tele-spectators could tolerate...