I personally enjoyed the program for what it was, as others have said it was not a documentary about the Lancaster.
The only thing which was glossed over, in my opinion, was the first two years of the war i.e before the Lancaster. The bombing was carried out by, as, one poster has said already, Stirlings and Halifax. One aircraft not mentioned at all if my ears did not let me down was the Wellington. It may have only had 2 engines but it did a great job for Bomber Command throughout the war. In fact I believe it was the only bomber built for the duration. The punishment it could take was also legendary, thanks to its structure.