Barrel rolls are all very good, IF you know what you are doing and you don't lose the aircraft in the manouvre. A certain 200 that got severely bent in, uhem, turbulence on a dead leg comes to mind..... One of the ex Rossair 1900s was rather bent with visibly wrinkled skins, widely suspected to be caused by a similar manouvre gone wrong.
The prototype Boeing 707 was rolled over Chicago - aaah yes, those were the days. Needless to say the test pilot was called in for cup of tea and a chat. But he knew what he was doing and trained in aerobatics.