Yes, there were a few that suprised us, but the neuroscience backed it up! Funny how myths start and persist.
Yes, big classes are often a must in countries with limited resources. Repetition and activities to cement learning are so important - how deep the learning goes depends on so many factors, such as the student's attention, study habits, home life and so on.
I feel sorry for teachers teaching to such class sizes, but then again, they have an excuse not to give individual attention!