The fireworks were incredible. The lighting of the Olympic cauldron was interesting, I like how all the torches came together to form one flame. Dh is slightly disappointed the Spice Girls weren't involved, lol. I was quite amused by Mr. Bean and James Bond jumping out of a helicopter with the Queen. All in all an enjoyable opening ceremony.
ETA I kind of got the feeling Sir Paul was slightly choked up in the beginning? I think that was why it sounded iffy. But maybe that was just me.
ETA2 I also really like that the building crew was part of the ceremony cheering on the torch as it was brought into the Colosseum.