I couldn't understand why French was used so much though.
French is the official language of the IOC, alongside English, so both are used (alongside the host nations official language where applicable).
Onto the ceremony, I thought it was excellent - I even liked the bit with Paul McCartney, and that's saying something as I can't stand the man. I was another person who was initially concerned by the lacklustre opening, but as soon as the Industrial Revolution transition got underway what they were trying to achieve became clearer.
I thought it was a lovely touch to have promising young athletes light the flame at the end - and glad to see Sir Steve Redgrave also carrying the flame.