I thoroughly agree with your observation. I heard the same broadcast in my car whilst driving to church for Mass that morning; whilst I recognised the voice of John Sentamu, the sound and acoustics were most definitely not those of York Minster, and I even wondered at that point if it was the Archbishop of York I was indeed listening to. My lady-friend has just taken the keyboard section of the ARCO at St. Paul's hall; knowing that she was going to be doing it there, when I heard said broadcast I was somewhat horrified. Others have told me very positive things about the instrument, however.