747 Focal, I have done the Cranfield exercise. We were told to evacuate as fast as possible and try to be out first. People were climbing over seats and other people to be out first, hence the 'reasonably fit' clause. Simulates mass panic and hysteria.
As for the slide heights, if youyr arse is on fire you would jump into the dark!
You can keep knocking the 380, but it will still be a success. The arguments about size were used on the first 747, and that was successful. The airlines and airports will adapt for the 380,(as they did for the 747), and the 380 will be a success also.